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Oxygène Oksigen أكسجين Tlen Oxygen Οξυγόνο Ossigeno 산소 Zuurstof (element) 氧 Sauerstoff Kyslík Oxigeno Кислород Syre Oksigeno 酸素 Oxigen Ocsaigin Кисень Oxígeno Oxigénio
rdfs:comment
L'oxygène est l'élément chimique de numéro atomique 8, de symbole O. C'est la tête de file du groupe des chalcogènes, souvent appelé groupe de l'oxygène. Découvert indépendamment en 1772 par le Suédois Carl Wilhelm Scheele à Uppsala, et en 1774 par Pierre Bayen à Châlons-en-Champagne ainsi que par le Britannique Joseph Priestley dans le Wiltshire, l'oxygène a été nommé ainsi en 1777 par le Français Antoine Lavoisier et son épouse à Paris à partir du grec ancien ὀξύς / oxús (« aigu », c'est-à-dire ici « acide »), et γενής / genḗs (« générateur »), car Lavoisier pensait à tort — oxydation et acidification étant reliées — que : 酸素（さんそ、英: oxygen、羅: oxygenium、仏: oxygène、独: Sauerstoff）は、原子番号8の元素である。元素記号はO。原子量は16.00。第16族元素、第2周期元素のひとつ。 L'oxigen és l'element químic de símbol O i nombre atòmic 8. És un calcogen, un no-metall molt reactiu i un oxidant que forma òxids amb facilitat amb la majoria dels altres elements, així com amb compostos. Tlen (O, łac. oxygenium) – pierwiastek chemiczny o liczbie atomowej 8, niemetal z grupy tlenowców w układzie okresowym. Stabilnymi izotopami tlenu są 16O (stanowi ponad 99% tlenu naturalnego), 17O oraz 18O. Tlen w stanie wolnym występuje w postaci cząsteczek dwuatomowych O2 oraz trójatomowych – ozonu O3 (głównie w ozonosferze). Wykryto jednak także cząsteczki cztero- i ośmioatomowe. Is dúil cheimiceach í an ocsaigin a bhíonn le fáil go flúirseach san atmaisféar. Faoi na gnáth-imthoscaí, bíonn adaimh na hocsaigine ceangailte dá chéile ina móilíní dé-adamhacha. Is í an tsiombail cheimiceach atá aici ná O. Is é a hocht (8) an uimhir adamhach atá aici, agus is é an meáchan adamhach atá aici ná 15.999. Zuurstof is een chemisch element met symbool O (Uit het Latijn: oxygenium) en atoomnummer 8. Het is een niet-metaal dat tot de zuurstofgroep (groep VIa of groep 16) in het periodiek systeem behoort. Zuurstof komt als enkelvoudige stof vooral als dizuurstof (O2) in de atmosfeer voor. In samengestelde vorm is het eveneens een wijdverspreid element omdat alle water van de oceanen en alle silicaten waar de aardkorst uit bestaat zuurstof bevatten. Gemeten naar massa is zuurstof veruit het meest voorkomende element in het menselijk lichaam: dat bestaat voor ongeveer 65% uit zuurstof (voornamelijk als bouwsteen van water). ( 이 문서는 8번 원소와 그것의 가장 안정한 상태인 O2에 관한 것입니다. O3에 대해서는 오존 문서를 참고하십시오.)( 산소(山所)에 대해서는 무덤 문서를 참고하십시오.) 산소(일본어: 酸素, 영어: Oxygen)는 화학 원소의 하나로, 원소 기호는 O(라틴어: Oxygenium)이고 원자 번호는 8이다. 일반적으로 산소원자 두 개가 결합하여 무색, 무미, 무취인 기체 상태로 존재한다. 공기의 주성분 중 하나로, 지구뿐 아니라 우주 전체에 걸쳐 다른 원소와 공유 결합된 상태로 널리 퍼져 있다. 유리 산소(산소 분자, O2)가 처음으로 지구 대기에 나타난 것은 고원생대로, 혐기성 생물(세균 및 고균)의 물질 대사 과정의 부산물로 만들어졌다. 유리 산소의 증가는 그 당시 대부분의 생물들을 죽음으로 몰아 갔으나, 반대로 산소를 이용하는 새로운 생물이 등장하는 계기가 되었다. 또한 오존층의 형성으로 육상생물이 등장하는 계기도 마련해주었다. 산소는 대부분 광합성 작용으로 만들어지는데, 약 4분의 3은 대양의 식물성 플랑크톤과 조류가, 나머지 4분의 1은 육상 식물이 만든다. Oksigen (bahasa Latin: Oxygenium), atau zat asam, terkadang disebut juga sebagai zat pembakar, adalah unsur kimia yang mempunyai lambang O dan nomor atom 8. Dalam tabel periodik, oksigen merupakan unsur nonlogam golongan VIA (kalkogen) dan dapat dengan mudah bereaksi dengan hampir semua unsur lainnya (utamanya menjadi oksida). Pada temperatur dan tekanan standar, dua atom oksigen berikatan menjadi O (dioksigen), gas yang tidak berwarna, tidak berasa, dan tidak berbau. Oksigen merupakan unsur paling melimpah ketiga di alam semesta berdasarkan massa (setelah hidren dan helium) dan unsur paling melimpah di kerak Bumi. Berdasarkan volume, 20,9% atmosfer bumi adalah oksigen. Ки́сень (також оксиге́н, або оксиґе́н; хімічний знак — , лат. oxygenium) — хімічний елемент з атомним номером 8, що належить до головної підгрупи (або підгрупи кисню) VI групи періодичної системи елементів (16-ї групи за номенклатурою IUPAC), 2-го періоду. Його простими речовинами є гази кисень та озон . Примітка. В українській мові протягом 1994 — 2019 рр., в рамках реформи хімічної термінології, діяв стандарт ДСТУ 2439-94, згідно з яким хімічний елемент мав назву «Оксиген». З 2019 року назву «Оксиген» скасовано, рекомендовано «кисень» як єдину назву хімічного елемента і найпоширенішої його простої речовини, але дозволено для елемента назву «оксиґен». Oksigeno (latine Oxygenium) estas kemia elemento kun la simbolo O kaj la atomnumero 8. Kongrue al sia atomnumero ĝi troviĝas en la oka pozicio de la perioda tabelo kaj apartenas al la 16a grupo, la grupo de la ĥalkogenoj. Konsiderante la mason oksigeno estas la plej abunda elemento de la terkrusto (45,5%) kaj 89% de la maso de akvo (H2O) estas oksigeno.Sub normalaj kondiĉoj oksigeno ekzistas kiel kovalenta duatoma molekulo konsistanta el du oksigenaj atomoj kun la resuma formulo O2 tiel nomata Dioksigeno. Ĝi estas senkolora kaj senodora gaso. La aero enhavas 20,942% da oksigeno.Ĝi rolulas en multaj brul- kaj korodiĝprocezoj. Ĝi ebligas la bruligon de la fueloj kiel gaso, benzino, oleo, mazuto, karbo, kaj ligno.Preskaŭ ĉiuj vivaĵoj bezonas oksigenon nepre por vivi (kutime plantoj tamen elig Kyslík (chemická značka O, latinsky Oxygenium) je plynný chemický prvek, tvořící druhou hlavní složku zemské atmosféry. Je biogenním prvkem a jeho přítomnost je nezbytná pro existenci většiny živých organismů na této planetě. Autorem jeho českého názvu je Jan Svatopluk Presl. Při dýchání vzduchu o obsahu kyslíku větším než 75 % (za normálního atmosférického tlaku) však dochází k většinou nenávratnému poškození plic. الأكسجين هو عنصر كيميائي رمزه O وعدده الذرّي 8، ويقع ضمن عناصر الدورة الثانية وعلى رأس المجموعة السادسة عشر (المجموعة السادسة وفق ترقيم المجموعات الرئيسية) في الجدول الدوري، والتي تدعى باسم مجموعة الكالكوجين، وهو عنصر مجموعة رئيسي. يصنّف الأكسجين ضمن اللافلزّات، ويكون في الشروط العاديّة من الضغط ودرجة الحرارة على شكل غاز ثنائي الذرّة O2. ليس له لون أو طعم أو رائحة. 氧（拼音：yǎnɡ，注音：丨ㄤˇ；英語：Oxygen），是一種化學元素，化學符號为O，原子序數为8，原子量為15.999 u，在元素週期表中屬於氧族。氧屬於非金屬，是具有高反應性的氧化劑，能夠與大部分元素形成氧化物。氧在宇宙中的總質量在所有元素中位列第三，僅居氫和氦之下。在標準溫度和壓力下，兩個氧原子会自然鍵合，形成無色無味的氧氣，即雙原子氧（）。氧氣是地球大氣層的主要成分之一，在體積上佔20.8%，仅次于氮气。地球地殼中近一半（46.6%）的質量都是由氧和氧化物所組成。 氧是細胞呼吸作用中重要的元素。在生物體中，主要有機分子，如蛋白質、核酸、碳水化合物和脂肪等，還有組成動物外殼、牙齒和骨骼的無機化合物，都含有氧原子。生物體絕大部分的質量都由含氧原子的水組成。光合作用利用陽光的能量把水和二氧化碳轉化為氧氣。氧氣的化學反應性強，容易與其他元素結合，所以大氣層中的氧氣成分只能通過生物的光合作用持續補充。臭氧（）是氧元素的另一種同素異構體，能夠較好地吸收中紫外線輻射。位於高海拔的臭氧層有助阻擋紫外線，從而保護生物圈。不過，在地表上的臭氧屬於污染物，為霧霾的副產品之一。在低地球軌道高度的單原子氧足以對航天器造成腐蝕。 氧的應用包括暖氣、內燃機、鋼鐵、塑料和布料的生產、金屬氣焊和氣割、火箭推進劑、氧療及航空器、潛艇、載人航天器和潛水所用的生命保障系統。 Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2. Diatomic oxygen gas currently constitutes 20.95% of the Earth's atmosphere, though this has changed considerably over long periods of time. Oxygen makes up almost half of the Earth's crust in the form of oxides. Το οξυγόνο (αγγλικά: oxygen) είναι το χημικό στοιχείο με χημικό σύμβολο O και ατομικό αριθμό 8. Είναι ένα μέλος των χαλκογόνων. Είναι, ακόμη, ένα πολύ δραστικό αμέταλλο χημικό στοιχείο και ένα οξειδωτικό μέσο που γρήγορα σχηματίζει χημικές ενώσεις, συγκεκριμένα οξείδια, με τα περισσότερα άλλα χημικά στοιχεία. Κατά μάζα, το οξυγόνο είναι το 3ο σε χημικό στοιχείο στο σύμπαν, δηλαδή αμέσως μετά το υδρογόνο και το ήλιο. Δύο άτομα οξυγόνου ενώνονται για να σχηματίσουν «διοξυγόνο», δηλαδή μια διατομική αλλομορφή του στοιχειακού οξυγόνου, που όταν είναι χημικά καθαρό και υπό κανονικές συνθήκες, είναι ένα αέριο άχρωμο, άοσμο και άγευστο, με μοριακό τύπο O2. El oxígeno es un elemento químico de número atómico 8 y representado por el símbolo O. Su nombre proviene de las raíces griegas ὀξύς (oxys) (‘ácido’, literalmente ‘punzante’, en referencia al sabor de los ácidos) y –γόνος (-gonos) (‘productor’, literalmente ‘engendrador’; es decir, "productor de ácidos"​), porque en la época en que se le dio esta denominación se creía, incorrectamente, que todos los ácidos requerían oxígeno para su composición. En condiciones normales de presión y temperatura, dos átomos del elemento se enlazan para formar el dioxígeno, un gas diatómico incoloro, inodoro e insípido con fórmula O2. Esta sustancia constituye una importante parte de la atmósfera y resulta necesaria para sostener la vida terrestre. Oxigenoa elementu kimiko bat da, O ikurra eta 8 atomo-zenbakia dituena. Grezieraz ὀξύς (oxys; «azido», hitzez hitz «zorrontz», azidoen zaporeei erreferentzia) eta -γόνος (-gonos; «jatorria»​). Aspaldi, oxigenoa azidoa ekoizteko ezinbestekoa zela uste zen; horregatik, oxigenoak "azidoa sortzen duen" esan nahi du. Baldintza estandarretan (T = 0 K eta p = 1 atm), bi oxigeno atomo lotzen dira sortuz. Dioxigenoa gas diatomiko, usaingabe eta zapore gabekoa da, formularekin izendatzen dena eta bizitza lurtarrarentzat ezinbestekoa dena. Кислоро́д (химический символ — O, от лат. Oxygenium) — химический элемент 16-й группы (по устаревшей классификации — главной подгруппы шестой группы, VIA), второго периода периодической системы Д. И. Менделеева, с атомным номером 8. Кислород — химически активный неметалл, является самым лёгким элементом из группы халькогенов. L'ossigeno è un elemento chimico con numero atomico 8 (simbolo O). È il primo elemento del gruppo 16 del sistema periodico, facente parte del blocco p. L'ossigeno è un elemento non metallico altamente reattivo (ossidante) che forma facilmente ossidi e altri composti con la maggior parte degli elementi. Per massa, è il terzo elemento più abbondante dell'universo dopo l'idrogeno e l'elio. Il suo isotopo più abbondante più stabile ha numero di massa 16. O oxigénio (português europeu) ou oxigênio (português brasileiro) é um elemento químico de número atómico 8 e símbolo O (8 protões e 8 eletrões) representando com massa atómica 16 u. Constitui parte do grupo dos calcogénios e é um não metal reactivo e um forte agente oxidante que facilmente forma compostos com a maioria doutros elementos, principalmente óxidos. Tem a segunda electronegatividade mais elevada de todos os elementos químicos, superado apenas pelo flúor. Medido pela sua massa, o oxigénio é o terceiro elemento mais abundante do universo, atrás do hidrogénio e hélio, e o mais abundante na crosta terrestre como parte de compostos óxidos, formando praticamente metade da sua massa. Em condições normais de pressão e temperatura, dois átomos do elemento ligam-se para formar o dioxigén Syre eller oxygen (latin: Oxygenium) är ett grundämne med tecknet O och atomnummer 8. För att minska risken för förväxling på svenska med syra och som en internationell anpassning kallar man ibland, till exempel på gastuber, ämnet för oxygen. Syre är vid standardtryck och -temperatur (STP) en gas, syrgas, O2, som förekommer i atmosfären i en halt av cirka 21 volymprocent. O2 benämns ofta "molekylärt syre". En mindre andel finns i formen O3, ozon. Sauerstoff (historisch auch Oxygenium, kurz Oxygen, genannt; gebildet aus altgriechisch ὀξύς oxýs „scharf, spitz, sauer“ und -gen, zusammen „Säureerzeuger, Säurebildner“) ist ein chemisches Element mit dem Elementsymbol O. Entsprechend seiner Ordnungszahl 8 steht es an achter Stelle im Periodensystem und dort zusammen mit den Elementen Schwefel, Selen, Tellur, Polonium und Livermorium, die die Chalkogene bilden, in der sechsten Hauptgruppe, bzw. 16. IUPAC-Gruppe. Sauerstoff ist bezüglich der Masse mit 48,9 % das häufigste Element der Erdkruste, das häufigste Element der Erdhülle und mit rund 30 % das zweithäufigste Element der Erde insgesamt (Eisen ist an 1. Stelle).
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foaf:depiction
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wdrs:describedby
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dct:subject
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L'oxigen és l'element químic de símbol O i nombre atòmic 8. És un calcogen, un no-metall molt reactiu i un oxidant que forma òxids amb facilitat amb la majoria dels altres elements, així com amb compostos. El seu nom ve dels ètims grecs ὀξύς (oxís) ('àcid', del gust dels àcids) i -γενής (-genes) ('productor', literalment 'engendrador'). Hom el representa pel símbol O. A la taula periòdica pertany al grup dels calcògens i al període 2. És un element no metàl·lic molt reactiu que forma compostos (particularment òxids) fàcilment amb gairebé tots els altres elements. En condicions normals de pressió i temperatura, dos àtoms de l'element s'enllacen per formar dioxigen, un gas diatòmic inodor i insípid de fórmula química O₂. L'oxigen és el tercer element més abundant de l'univers en massa, després de l'hidrogen i l'heli, i l'element més abundant en massa de l'escorça terrestre. El gas oxigen diatòmic constitueix el 20,9% del volum de l'atmosfera de la Terra. Totes les classes principals de molècules estructurals dels éssers vius, com ara les proteïnes, els glúcids i els lípids, contenen oxigen, igual que els principals compostos inorgànics que es troben a les closques, dents i ossos dels animals. L'oxigen en forma O₂ és produït a partir de l'aigua pels cianobacteris, les algues i les plantes durant la fotosíntesi, i és utilitzat en la respiració cel·lular de totes les formes de vida complexes. L'oxigen és tòxic pels organismes anaerobis obligats, que foren la forma dominant de vida primitiva a la Terra fins que el O₂ començà a acumular-se a l'atmosfera fa uns 2.500 milions d'anys. Una altra forma (al·lotròpica) de l'oxigen, l'ozó (O₃), ajuda a protegir la biosfera de la radiació ultraviolada amb la capa d'ozó, situada a gran altitud (però és un agent contaminant a la troposfera, on és un producte secundari del boirum). En altituds encara més elevades (òrbita terrestre baixa) l'oxigen atòmic té una presència important i és una causa d'. L'oxigen fou descobert independentment per Carl Wilhelm Scheele a Uppsala, el 1773 o abans, i Joseph Priestley a Anglaterra, el 1774, però sovint es dona la prioritat a Priestley, car la seva publicació fou impresa abans. El nom «oxigen» fou encunyat el 1777 per Antoine Lavoisier, els experiments del qual amb aquest element contribuïren a desacreditar l'aleshores popular teoria del flogist de la combustió i la corrosió. L'oxigen és produït industrialment per destil·lació fraccionada d'aire liquat, eliminant el diòxid de carboni i el nitrogen de l'aire per mitjà de zeolites, per l'electròlisi de l'aigua i altres mitjans. L'oxigen s'usa en la producció de l'acer, de plàstics i tèxtils, com a combustible de coets, en l'oxigenoteràpia, i com a part de l'equip de manteniment de vida en aeronaus, submarins, viatges espacials i submarinisme. L'oxygène est l'élément chimique de numéro atomique 8, de symbole O. C'est la tête de file du groupe des chalcogènes, souvent appelé groupe de l'oxygène. Découvert indépendamment en 1772 par le Suédois Carl Wilhelm Scheele à Uppsala, et en 1774 par Pierre Bayen à Châlons-en-Champagne ainsi que par le Britannique Joseph Priestley dans le Wiltshire, l'oxygène a été nommé ainsi en 1777 par le Français Antoine Lavoisier et son épouse à Paris à partir du grec ancien ὀξύς / oxús (« aigu », c'est-à-dire ici « acide »), et γενής / genḗs (« générateur »), car Lavoisier pensait à tort — oxydation et acidification étant reliées — que : « Nous avons donné à la base de la portion respirable de l'air le nom d'oxygène, en le dérivant de deux mots grecs ὀξύς, acide et γείνομαι, j'engendre, parce qu'en effet une des propriétés les plus générales de cette base [Lavoisier parle de l'oxygène] est de former des acides en se combinant avec la plupart des substances. Nous appellerons donc gaz oxygène la réunion de cette base avec le calorique. » Une molécule de formule chimique O2, appelée communément « oxygène » mais « dioxygène » par les chimistes, est constituée de deux atomes d'oxygène reliés par liaison covalente : aux conditions normales de température et de pression, le dioxygène est un gaz, qui constitue 20,8 % du volume de l'atmosphère terrestre au niveau de la mer. L'oxygène est un non-métal qui forme très facilement des composés, notamment des oxydes, avec pratiquement tous les autres éléments chimiques. Cette facilité se traduit par des énergies de formation élevées mais, cinétiquement, le dioxygène est souvent peu réactif à température ambiante. Ainsi un mélange de dioxygène et de dihydrogène, de fer ou de soufre, etc., n'évolue qu'extrêmement lentement. C'est, en masse, le troisième élément le plus abondant de l'Univers après l'hydrogène et l'hélium, et le plus abondant des éléments de l'écorce terrestre ; l'oxygène constitue ainsi sur Terre : * 86 % de la masse des océans, sous la forme d'eau ; * 46,4 % de la masse de l'écorce terrestre, en particulier sous forme d'oxydes et de silicates ; * 23,1 % de la masse de l'air, sous forme de dioxygène ou d'ozone, soit 1,2 × 1015 tonnes, soit près de 21 % du volume total de l'atmosphère ; * 62,5 % de la masse du corps humain ; * jusqu'à 88 % de la masse de certains animaux marins. La Terre était à l'origine dépourvue de dioxygène. Celui-ci s'est formé grâce à la photosynthèse réalisée par les végétaux, les algues et les cyanobactéries, ces dernières étant apparues il y a peut-être 2,8 milliards d'années. Le dioxygène O2 est toxique pour les organismes anaérobies, dont faisaient partie les premières formes de vie apparues sur Terre, mais est indispensable à la respiration des organismes aérobies, qui constituent la grande majorité des espèces vivantes actuelles. La respiration cellulaire est l'ensemble des voies métaboliques, telles que le cycle de Krebs et la chaîne respiratoire, alimentées par exemple par la glycolyse et la β-oxydation, par lesquelles une cellule produit de l'énergie sous forme d'ATP et du pouvoir réducteur sous forme de NADH + H+ et de FADH2. En s'accumulant dans l'atmosphère terrestre, le dioxygène O2 issu de la photosynthèse a formé une couche d'ozone à la base de la stratosphère sous l'effet du rayonnement solaire. L'ozone est un allotrope de l'oxygène de formule chimique O3 encore plus oxydant que le dioxygène — ce qui en fait un polluant indésirable lorsqu'il est présent dans la troposphère au niveau du sol — mais qui a la particularité d'absorber les rayons ultraviolets du Soleil et donc de protéger la biosphère de ce rayonnement nocif : la couche d'ozone a constitué le bouclier qui a permis aux premières plantes terrestres de quitter les océans il y a près de 475 millions d'années. La teneur en oxygène des océans chute significativement depuis plusieurs années. Cette désoxygénation de l’océan — due au réchauffement climatique et aux rejets d’engrais agricoles — affecte la biodiversité marine. Les océans ont perdu 77 milliards de tonnes d’oxygène au cours des cinquante dernières années. Dans l'industrie, il a une énorme importance en tant qu'oxydant. Dans les centrales électriques, le combustible est brûlé soit avec de l'air, soit avec de l'oxygène pur (procédé oxy-fuel). L'oxy-craquage de fractions pétrolières lourdes produit des composés précieux. Par exemple, l'industrie chimique l'utilise pour la production d'acide acrylique, un monomère très important. L'oxydation catalytique hétérogène est prometteuse pour la production d'acide benzoïque. C'est également une matière première prometteuse pour la synthèse électrochimique du peroxyde d'hydrogène. L'oxydation par l'air joue un rôle très important dans la conversion des gaz dangereux (CO, méthane) en CO2 moins nocif. الأكسجين هو عنصر كيميائي رمزه O وعدده الذرّي 8، ويقع ضمن عناصر الدورة الثانية وعلى رأس المجموعة السادسة عشر (المجموعة السادسة وفق ترقيم المجموعات الرئيسية) في الجدول الدوري، والتي تدعى باسم مجموعة الكالكوجين، وهو عنصر مجموعة رئيسي. يصنّف الأكسجين ضمن اللافلزّات، ويكون في الشروط العاديّة من الضغط ودرجة الحرارة على شكل غاز ثنائي الذرّة O2. ليس له لون أو طعم أو رائحة. يتميّز الأكسجين الذرّي بنشاطه الكيميائي الكبير، حيث أنّه من المؤكسدات القويّة، ويميل إلى الارتباط لتشكيل المركّبات الكيميائيّة، وخاصّة الأكاسيد. كما يعدّ أحد أهمّ العناصر الموجودة في الأرض، وهو واسع الانتشار، حيث يشكّل غاز الأكسجين 20.94% من تركيب الغلاف الجوّي للأرض؛ بالإضافة إلى وجود شكل متآصل منه وهو الأوزون O3. إنّ أكثر العناصر وفرة في القشرة الأرضية هو الأكسجين، حيث يوجد بنسبة 48.9% وزناً، وهو يأتي في المرتبة الثانية بعد الحديد من حيث وفرة العناصر في تركيب الأرض ككل. يوجد الأكسجين الذرّي بوفرة في الكون، حيث يعدّ ثالث عنصر من حيث الوفرة بعد الهيدروجين والهيليوم. هناك ثلاثة نظائر مستقرّة للأكسجين 16O و 17O و 18O، أكثرها وفرةً هو الأكسجين-16، حيث تبلغ وفرته الطبيعيّة 99.8%. للأكسجين أهميّة حيويّة كبيرة جداً، حيث لا غنى عنه لاستمرار الحياة على سطح الأرض ، فهو أساس عملية التنفّس الخلوي عند الإنسان والحيوانات، كما يدخل في عملية التركيب الضوئي عند النباتات. بالإضافة إلى ذلك فهو أساس عملية الاحتراق، كما يسهم في عمليات التآكل. Oksigeno (latine Oxygenium) estas kemia elemento kun la simbolo O kaj la atomnumero 8. Kongrue al sia atomnumero ĝi troviĝas en la oka pozicio de la perioda tabelo kaj apartenas al la 16a grupo, la grupo de la ĥalkogenoj. Konsiderante la mason oksigeno estas la plej abunda elemento de la terkrusto (45,5%) kaj 89% de la maso de akvo (H2O) estas oksigeno.Sub normalaj kondiĉoj oksigeno ekzistas kiel kovalenta duatoma molekulo konsistanta el du oksigenaj atomoj kun la resuma formulo O2 tiel nomata Dioksigeno. Ĝi estas senkolora kaj senodora gaso. La aero enhavas 20,942% da oksigeno.Ĝi rolulas en multaj brul- kaj korodiĝprocezoj. Ĝi ebligas la bruligon de la fueloj kiel gaso, benzino, oleo, mazuto, karbo, kaj ligno.Preskaŭ ĉiuj vivaĵoj bezonas oksigenon nepre por vivi (kutime plantoj tamen eligas dum fotosintezo pli da oksigeno ol ili forkonsumas). Plej ofte ili prenas ĝin per spiro el la aero aŭ per ensorbo el la akvo (solvita oksigeno). Altkoncentrite oksigeno estas venena al la plej multaj vivaĵoj.La metastabila, plienergienhava kaj reakciema alotropa formo de oksigeno, konsistanta el tri atomoj, nomiĝas Ozono (O3).Atoma oksigeno en la formo de unuopaj oksigenatomoj nur ekzistas sub ekstremaj kondiĉoj kiel ekzemple en la vakuo de la interstela spaco aŭ en varmegaj stelaj atmosferoj. Ĝi tamen agas kiel grava reakciema intermedia produkto en kelkaj reakcioj de atmosfera kemio. Syre eller oxygen (latin: Oxygenium) är ett grundämne med tecknet O och atomnummer 8. För att minska risken för förväxling på svenska med syra och som en internationell anpassning kallar man ibland, till exempel på gastuber, ämnet för oxygen. Syre är vid standardtryck och -temperatur (STP) en gas, syrgas, O2, som förekommer i atmosfären i en halt av cirka 21 volymprocent. O2 benämns ofta "molekylärt syre". En mindre andel finns i formen O3, ozon. Sauerstoff (historisch auch Oxygenium, kurz Oxygen, genannt; gebildet aus altgriechisch ὀξύς oxýs „scharf, spitz, sauer“ und -gen, zusammen „Säureerzeuger, Säurebildner“) ist ein chemisches Element mit dem Elementsymbol O. Entsprechend seiner Ordnungszahl 8 steht es an achter Stelle im Periodensystem und dort zusammen mit den Elementen Schwefel, Selen, Tellur, Polonium und Livermorium, die die Chalkogene bilden, in der sechsten Hauptgruppe, bzw. 16. IUPAC-Gruppe. Sauerstoff ist bezüglich der Masse mit 48,9 % das häufigste Element der Erdkruste, das häufigste Element der Erdhülle und mit rund 30 % das zweithäufigste Element der Erde insgesamt (Eisen ist an 1. Stelle). Unter Normalbedingung tritt Sauerstoff in Form eines kovalenten Homodimers auf, also einer Verbindung aus zwei Sauerstoff-Atomen und mit der Summenformel O2, bezeichnet als molekularer Sauerstoff, Dioxygen oder Disauerstoff. Es ist ein farb- und geruchloses Gas, das in der Luft zu 20,942 % enthalten ist. Es ist an vielen Verbrennungs- und Korrosionsvorgängen beteiligt. Fast alle Lebewesen benötigen Sauerstoff zum Leben (in der Regel geben Pflanzen aber während der Photosynthese mehr Sauerstoff ab, als sie verbrauchen). Sie entnehmen ihn meistens durch Atmung aus der Luft oder durch Resorption aus Wasser (gelöster Sauerstoff). In hohen Konzentrationen dagegen ist er für die meisten Lebewesen giftig. Die metastabile, energiereiche und reaktive allotrope Form aus drei Sauerstoffatomen (O3) wird Ozon genannt. Atomarer Sauerstoff, das heißt Sauerstoff in Form freier, einzelner Sauerstoffatome, kommt stabil nur unter extremen Bedingungen vor, beispielsweise im Vakuum des Weltalls oder in heißen Sternatmosphären. Er hat jedoch eine wesentliche Bedeutung als reaktives Zwischenprodukt in vielen Reaktionen der Atmosphärenchemie. 氧（拼音：yǎnɡ，注音：丨ㄤˇ；英語：Oxygen），是一種化學元素，化學符號为O，原子序數为8，原子量為15.999 u，在元素週期表中屬於氧族。氧屬於非金屬，是具有高反應性的氧化劑，能夠與大部分元素形成氧化物。氧在宇宙中的總質量在所有元素中位列第三，僅居氫和氦之下。在標準溫度和壓力下，兩個氧原子会自然鍵合，形成無色無味的氧氣，即雙原子氧（）。氧氣是地球大氣層的主要成分之一，在體積上佔20.8%，仅次于氮气。地球地殼中近一半（46.6%）的質量都是由氧和氧化物所組成。 氧是細胞呼吸作用中重要的元素。在生物體中，主要有機分子，如蛋白質、核酸、碳水化合物和脂肪等，還有組成動物外殼、牙齒和骨骼的無機化合物，都含有氧原子。生物體絕大部分的質量都由含氧原子的水組成。光合作用利用陽光的能量把水和二氧化碳轉化為氧氣。氧氣的化學反應性強，容易與其他元素結合，所以大氣層中的氧氣成分只能通過生物的光合作用持續補充。臭氧（）是氧元素的另一種同素異構體，能夠較好地吸收中紫外線輻射。位於高海拔的臭氧層有助阻擋紫外線，從而保護生物圈。不過，在地表上的臭氧屬於污染物，為霧霾的副產品之一。在低地球軌道高度的單原子氧足以對航天器造成腐蝕。 卡爾·威廉·舍勒於1773年或之前在烏普薩拉最早發現氧元素。約瑟夫·普利斯特里亦於1774年在威爾特郡獨立發現氧，因為其成果的發表日期較舍勒早，所以一般被譽為氧的發現者。1777年，安托万-洛朗·德·拉瓦锡進行了一系列有關氧的實驗，推翻了當時用於解釋燃燒和腐蝕的燃素說。他也提出了氧的現用IUPAC名稱「oxygen」，源自希臘語中的「ὀξύς」（oxys，尖銳，指酸）和「-γενής」（-genes，產生者）。這是因為命名之時，人們曾以為所有酸都必須含有氧。在東亞，日本最先開始接觸现代化學，因此將其直譯為酸素，今天依然是氧的日文汉字名稱。在中國則是清末由徐壽等人的翻譯書籍傳入許多化學詞彙，其中原法文元素名「oxygène」被譯為「養」，後譯為「氱」，最終演變為今天的中文名「氧」。 氧的應用包括暖氣、內燃機、鋼鐵、塑料和布料的生產、金屬氣焊和氣割、火箭推進劑、氧療及航空器、潛艇、載人航天器和潛水所用的生命保障系統。 Кислоро́д (химический символ — O, от лат. Oxygenium) — химический элемент 16-й группы (по устаревшей классификации — главной подгруппы шестой группы, VIA), второго периода периодической системы Д. И. Менделеева, с атомным номером 8. Кислород — химически активный неметалл, является самым лёгким элементом из группы халькогенов. Как простое вещество (при нормальных условиях) кислород — газ без цвета, вкуса и запаха, молекула которого состоит из двух атомов (формула — O2). Систематическое название: дикислород.Жидкий кислород(при низких температурах) имеет светло-голубой цвет, а твёрдый(при низких температурах) представляет собой кристаллы светло-синего цвета. Существуют и другие аллотропные формы кислорода, например, озон — при нормальных условиях газ голубого цвета со специфическим запахом, молекула которого состоит из трёх атомов кислорода (формула O3). Систематическое название: трикислород. Часто можно почувствовать запах озона после грозы. Озон образует озоновый слой в стратосфере, который защищает нашу планету от ультрафиолета. Tlen (O, łac. oxygenium) – pierwiastek chemiczny o liczbie atomowej 8, niemetal z grupy tlenowców w układzie okresowym. Stabilnymi izotopami tlenu są 16O (stanowi ponad 99% tlenu naturalnego), 17O oraz 18O. Tlen w stanie wolnym występuje w postaci cząsteczek dwuatomowych O2 oraz trójatomowych – ozonu O3 (głównie w ozonosferze). Wykryto jednak także cząsteczki cztero- i ośmioatomowe. Tlen jest paramagnetykiem. Ciekły tlen ma barwę niebieską. Stały tlen znany jest w sześciu odmianach alotropowych, do których należy tzw. „czerwony tlen” i tlen metaliczny, stabilne w warunkach bardzo wysokich ciśnień. Oksigen (bahasa Latin: Oxygenium), atau zat asam, terkadang disebut juga sebagai zat pembakar, adalah unsur kimia yang mempunyai lambang O dan nomor atom 8. Dalam tabel periodik, oksigen merupakan unsur nonlogam golongan VIA (kalkogen) dan dapat dengan mudah bereaksi dengan hampir semua unsur lainnya (utamanya menjadi oksida). Pada temperatur dan tekanan standar, dua atom oksigen berikatan menjadi O (dioksigen), gas yang tidak berwarna, tidak berasa, dan tidak berbau. Oksigen merupakan unsur paling melimpah ketiga di alam semesta berdasarkan massa (setelah hidren dan helium) dan unsur paling melimpah di kerak Bumi. Berdasarkan volume, 20,9% atmosfer bumi adalah oksigen. Semua kelompok molekul organik pada makhluk hidup, seperti protein, karbohidrat, dan lemak, mengandung unsur oksigen. Demikian pula senyawa anorganik yang terdapat pada cangkang, gigi, dan tulang hewan. Sebagian besar oksigen dalam tubuh makhluk hidup dalam bentuk air (H2O), senyawa penting pada makhluk hidup. Oksigen dalam bentuk O dihasilkan dari air oleh sianobakteri, ganggang, dan tumbuhan selama fotosintesis, dan digunakan pada respirasi sel oleh hampir semua makhluk hidup. Oksigen beracun bagi organisme anaerob, yang merupakan bentuk kehidupan paling dominan pada masa-masa awal evolusi kehidupan. O kemudian mulai berakumulasi di atmosfer sekitar 2,5 miliar tahun yang lalu. Terdapat pula alotrop oksigen lainnya, yaitu ozon (O). Lapisan ozon pada atmosfer membantu melindungi biosfer dari radiasi ultraviolet, tetapi pada permukaan bumi ia adalah polutan yang merupakan produk samping dari asbut. Oksigen secara terpisah ditemukan oleh Carl Wilhelm Scheele di Uppsala pada tahun 1773 dan Joseph Priestley di Wiltshire pada tahun 1774. Temuan Priestley lebih terkenal oleh karena publikasinya merupakan yang pertama kali dicetak. Namun, Priestley memanggil oksigen "dephlogisticated air" dan tidak mengetahuinya sebagai elemen kimia. Istilah oxygen diciptakan oleh Antoine Lavoisier pada tahun 1777, yang eksperimennya dengan oksigen berhasil meruntuhkan teori flogiston pembakaran dan korosi yang terkenal. Ia juga berhasil menjelaskan peran oksigen dalam pembakaran. Oksigen secara industri dihasilkan dengan udara cair, dengan menggunakan zeolit untuk memisahkan karbon dioksida dan nitrogen dari udara, ataupun elektrolisis air, dll. Oksigen digunakan dalam produksi baja, plastik, dan tekstil, ia juga digunakan sebagai propelan roket, untuk terapi oksigen, dan sebagai penyokong kehidupan pada pesawat terbang, kapal selam, penerbangan luar angkasa, dan . O oxigénio (português europeu) ou oxigênio (português brasileiro) é um elemento químico de número atómico 8 e símbolo O (8 protões e 8 eletrões) representando com massa atómica 16 u. Constitui parte do grupo dos calcogénios e é um não metal reactivo e um forte agente oxidante que facilmente forma compostos com a maioria doutros elementos, principalmente óxidos. Tem a segunda electronegatividade mais elevada de todos os elementos químicos, superado apenas pelo flúor. Medido pela sua massa, o oxigénio é o terceiro elemento mais abundante do universo, atrás do hidrogénio e hélio, e o mais abundante na crosta terrestre como parte de compostos óxidos, formando praticamente metade da sua massa. Em condições normais de pressão e temperatura, dois átomos do elemento ligam-se para formar o dioxigénio, um gás diatómico com fórmula O2. Este gás diatómico constitui 20,8% da atmosfera e é fundamental para suportar a vida terrestre. Não obstante, vários estudos dos níveis de oxigénio atmosférico indicam uma progressão global descendente na proporção deste elemento, principalmente por causa das emissões procedentes da queima de combustíveis fósseis. É um gás incolor (azul em estado líquido e sólido), inodoro e insípido, comburente, não combustível e pouco solúvel em água. O dioxigénio é usado na respiração celular e muitas das principais moléculas orgânicas dos organismos vivos como proteínas, ácidos nucleicos, carboidratos e lípidos contêm oxigénio, além dos principais compostos inorgânicos que formam as conchas, os dentes e os ossos dos animais. A maior parte da massa dos organismos vivos é composta por oxigénio enquanto componente da água, o principal constituinte das formas de vida. Devido à sua reactividade química, o oxigénio não pode permanecer na atmosfera terrestre como elemento livre sem que seja constantemente reabastecido pela acção fotossintética dos organismos que utilizam a energia solar para produzir oxigénio a partir da água. O oxigénio elementar O2 somente começou a acumular-se na atmosfera depois do aparecimento destes organismos, há aproximadamente 2 500 milhões de anos. O alótropo ozono (O3) é um forte absorvente de radiação ultravioleta, e a camada de ozono da Terra, a grande altitude, ajuda a proteger a biosfera da incidência de radiação procedente do Sol. Porém, o ozono é um agente contaminante perto da superfície terrestre, sendo um produto derivado do smog. A altitudes de órbita terrestre baixa, o oxigénio atómico presente provoca a corrosão das naves espaciais. O oxigénio foi descoberto autonomamente por Carl Wilhelm Scheele em Uppsala, no ano de 1773, e por Joseph Priestley em Wiltshire no ano de 1774, no entanto é Priestley quem costuma ser designado prioritariamente, uma vez que a sua obra foi a primeira a ser publicada. Em 1777, Antoine Lavoisier cunhou o seu nome e suas experiências com o oxigénio ajudaram a desacreditar a até então popular teoria do flogisto da combustão e corrosão. O nome deriva do grego ὀξύς (oxys) («ácido», literalmente «picante», em alusão ao sabor dos ácidos) e γόνος (-gonos) («produtor», literalmente «gerar»), porque na época em que se lhe deu esta denominação acreditava-se, equivocadamente, que todos os ácidos necessitavam de oxigénio para a sua composição. As aplicações habituais do oxigénio incluem, entre outras, o seu uso em calefações residenciais e motores de combustão interna, a produção de aço, plásticos e têxteis, aplicações de corte industrial e soldadura de aços e outros metais, como propulsor para foguetes, para terapias de oxigénio e sistemas de suporte à vida em aeronaves, submarinos, naves espaciais tripuladas e mergulho. L'ossigeno è un elemento chimico con numero atomico 8 (simbolo O). È il primo elemento del gruppo 16 del sistema periodico, facente parte del blocco p. L'ossigeno è un elemento non metallico altamente reattivo (ossidante) che forma facilmente ossidi e altri composti con la maggior parte degli elementi. Per massa, è il terzo elemento più abbondante dell'universo dopo l'idrogeno e l'elio. Il suo isotopo più abbondante più stabile ha numero di massa 16. A temperatura e pressione standard due atomi dell'elemento si legano per formare una molecola di diossigeno (formula chimica O2), un gas incolore e inodore che costituisce il 20,8% dell'atmosfera terrestre (l'ossigeno è chimicamente troppo reattivo per rimanere un elemento libero nell'aria); legato ad altri elementi, è l'elemento chimico più comune della crosta terrestre, rappresentandone circa il 47% della massa, ed entra inoltre nella molecola dell'acqua. L'ossigeno è essenziale per la vita della maggior parte degli esseri viventi in quanto necessario alla respirazione; inoltre, le principali classi di molecole organiche presenti negli organismi viventi, come le proteine, gli acidi nucleici, i carboidrati e i lipidi, contengono ossigeno. Nelle attività umane viene comunemente utilizzato per l'ossigenoterapia, il sistema di supporto vitale degli aeromobili, dei sottomarini e dei veicoli spaziali, per le attività subacquee ricreative, come propellente per i razzi. Entra inoltre nei processi di produzione dell'acciaio e della plastica, nella brasatura, saldatura e il taglio di alcuni metalli. Oxigenoa elementu kimiko bat da, O ikurra eta 8 atomo-zenbakia dituena. Grezieraz ὀξύς (oxys; «azido», hitzez hitz «zorrontz», azidoen zaporeei erreferentzia) eta -γόνος (-gonos; «jatorria»​). Aspaldi, oxigenoa azidoa ekoizteko ezinbestekoa zela uste zen; horregatik, oxigenoak "azidoa sortzen duen" esan nahi du. Baldintza estandarretan (T = 0 K eta p = 1 atm), bi oxigeno atomo lotzen dira sortuz. Dioxigenoa gas diatomiko, usaingabe eta zapore gabekoa da, formularekin izendatzen dena eta bizitza lurtarrarentzat ezinbestekoa dena. Taula periodikoan, 16. taldean (kalkogenoak edo oxigenoideak) eta 2. periodoan kokatuta dago. Oxigenoaren balentziari dagokionez, arruntena −2 da, baina beste batzuk ere baditu (−1,+1,+2, ...). Oxigenoa ez-metala da eta elementu gehienekin erraz erreakzionatzen du, gas nobleekin, eta halogenoekin izan ezik. Halaber, oxidatzaile sendoa eta elektronegatibotasun handieneko bigarren elementua da fluorraren ondoren. Oxigenoaren masan oinarrituz, unibertsoko hirugarren elementurik ugariena da, hidrogenoaren eta helioaren ondoren, eta lurrazalaren elementurik aberatsena da. Atmosferan, oxigenoa elementu aske bezala aurkitzea posible da, fotosintesia egiten duten organismoek etengabe hornitzen dituztelako. Fotosintesirik ez balego, oxigenoak ezingo luke elementu aske bezala egon atmosferan, oso erreaktiboa delako. 2.500 milioi urte inguru, organismo horiek agertu ondoren hasi zen oxigeno elementala atmosferan pilatzen, eta, gaur egun, dioxigenoak atmosferako bolumenaren % 20,8 osatzen du. Oxigenoaren beste forma alotropo batek, ozonoak, biosfera argi ultramoretik babesten du atmosferako ozono-geruzari esker. Haatik, lurrazal mailan ozonoa kutsatzailea da. Izaki bizidun gehienentzat nahitaezkoa da. Izaki bizidunetako egiturazko molekula mota guztiek, hala nola proteinek, karbohidratoek edo gantzek, oxigenoa daukate osagaitzat. Era berean, animalien maskor, hortz eta hezurrak osatzen dituzten konposatu inorganiko gehienek ere oxigenoa daukate. Zianobakterioek, algek eta landareek oxigenoa ekoizten dute, bere forma diatomikoan fotosintesian zehar, eta zelulen arnasketan erabiltzen dute izaki bizidun konplexu guztiek. Oxigenoa toxikoa da organismo anaerobikoentzat. Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2. Diatomic oxygen gas currently constitutes 20.95% of the Earth's atmosphere, though this has changed considerably over long periods of time. Oxygen makes up almost half of the Earth's crust in the form of oxides. Many major classes of organic molecules in living organisms contain oxygen atoms, such as proteins, nucleic acids, carbohydrates, and fats, as do the major constituent inorganic compounds of animal shells, teeth, and bone. Most of the mass of living organisms is oxygen as a component of water, the major constituent of lifeforms. Oxygen is continuously replenished in Earth's atmosphere by photosynthesis, which uses the energy of sunlight to produce oxygen from water and carbon dioxide. Oxygen is too chemically reactive to remain a free element in air without being continuously replenished by the photosynthetic action of living organisms. Another form (allotrope) of oxygen, ozone (O3), strongly absorbs ultraviolet UVB radiation and the high-altitude ozone layer helps protect the biosphere from ultraviolet radiation. However, ozone present at the surface is a byproduct of smog and thus a pollutant. Oxygen was isolated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774. Priority is often given for Priestley because his work was published first. Priestley, however, called oxygen "dephlogisticated air", and did not recognize it as a chemical element. The name oxygen was coined in 1777 by Antoine Lavoisier, who first recognized oxygen as a chemical element and correctly characterized the role it plays in combustion. Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving. El oxígeno es un elemento químico de número atómico 8 y representado por el símbolo O. Su nombre proviene de las raíces griegas ὀξύς (oxys) (‘ácido’, literalmente ‘punzante’, en referencia al sabor de los ácidos) y –γόνος (-gonos) (‘productor’, literalmente ‘engendrador’; es decir, "productor de ácidos"​), porque en la época en que se le dio esta denominación se creía, incorrectamente, que todos los ácidos requerían oxígeno para su composición. En condiciones normales de presión y temperatura, dos átomos del elemento se enlazan para formar el dioxígeno, un gas diatómico incoloro, inodoro e insípido con fórmula O2. Esta sustancia constituye una importante parte de la atmósfera y resulta necesaria para sostener la vida terrestre. Forma parte del grupo de los anfígenos en la tabla periódica y es un elemento no metálico altamente reactivo que forma fácilmente compuestos (especialmente óxidos) con la mayoría de elementos, excepto con los gases nobles helio y neón. Asimismo, es un fuerte agente oxidante y tiene la segunda electronegatividad más alta de todos los elementos, solo superada por el flúor.​ Medido por su masa, el oxígeno es el tercer elemento más abundante del universo, tras el hidrógeno y el helio,​ y el más abundante en la corteza terrestre ya que forma, prácticamente, la mitad de su masa.​ Debido a su reactividad química, no puede permanecer en la atmósfera terrestre como elemento libre sin ser reabastecido constantemente por la acción fotosintética de los organismos que utilizan la energía solar para producir oxígeno elemental a partir del agua. El oxígeno elemental O2 solamente empezó a acumularse en la atmósfera después de la aparición de estos organismos, aproximadamente hace 2500 millones de años.​ El oxígeno diatómico constituye el 20,8 % del volumen de la atmósfera terrestre.​ Dado que constituye la mayor parte de la masa del agua, es también el componente mayoritario de la masa de los seres vivos. Muchas de las moléculas más importantes que forman parte de los seres vivos, como las proteínas, los ácidos nucleicos, los carbohidratos y los lípidos, contienen oxígeno, así como los principales compuestos inorgánicos que forman los caparazones, dientes y huesos animales. El oxígeno elemental se produce por cianobacterias, algas y plantas y todas las formas complejas de vida lo usan para su respiración celular. Resulta tóxico para los organismos de tipo anaerobio obligado, las formas tempranas de vida que predominaban en la Tierra hasta que el O2 comenzó a acumularse en la atmósfera. Otra forma (alótropa) del oxígeno, el ozono (O3), ayuda a proteger la biosfera de la radiación ultravioleta a gran altitud, en la llamada capa de ozono, pero es contaminante cerca de la superficie, donde es un subproducto del esmog. A altitudes aún mayores de la órbita baja terrestre, el oxígeno atómico tiene una presencia significativa y causa erosión en las naves espaciales.​ Carl Wilhelm Scheele descubrió el oxígeno de forma independiente en Upsala en 1773, o incluso antes, y Joseph Priestley, en Wiltshire en 1774, pero el honor suele adjudicársele a Priestley debido a que publicó su trabajo antes. Antoine Lavoisier, cuyas investigaciones ayudaron a desacreditar la entonces popular teoría del flogisto de combustión y corrosión, acuñó el nombre «oxígeno» en 1777.​ Este se produce industrialmente mediante la destilación fraccionada de aire licuado, el uso de zeolita con para concentrar el oxígeno del aire, la electrólisis del agua y otros medios. El oxígeno se utiliza en la producción de acero, plásticos y textiles; los propulsores de cohetes; la oxigenoterapia; y la asistencia para la respiración en aeronaves, submarinos, vuelos espaciales y submarinismo. Ки́сень (також оксиге́н, або оксиґе́н; хімічний знак — , лат. oxygenium) — хімічний елемент з атомним номером 8, що належить до головної підгрупи (або підгрупи кисню) VI групи періодичної системи елементів (16-ї групи за номенклатурою IUPAC), 2-го періоду. Його простими речовинами є гази кисень та озон . Примітка. В українській мові протягом 1994 — 2019 рр., в рамках реформи хімічної термінології, діяв стандарт ДСТУ 2439-94, згідно з яким хімічний елемент мав назву «Оксиген». З 2019 року назву «Оксиген» скасовано, рекомендовано «кисень» як єдину назву хімічного елемента і найпоширенішої його простої речовини, але дозволено для елемента назву «оксиґен». ( 이 문서는 8번 원소와 그것의 가장 안정한 상태인 O2에 관한 것입니다. O3에 대해서는 오존 문서를 참고하십시오.)( 산소(山所)에 대해서는 무덤 문서를 참고하십시오.) 산소(일본어: 酸素, 영어: Oxygen)는 화학 원소의 하나로, 원소 기호는 O(라틴어: Oxygenium)이고 원자 번호는 8이다. 일반적으로 산소원자 두 개가 결합하여 무색, 무미, 무취인 기체 상태로 존재한다. 공기의 주성분 중 하나로, 지구뿐 아니라 우주 전체에 걸쳐 다른 원소와 공유 결합된 상태로 널리 퍼져 있다. 유리 산소(산소 분자, O2)가 처음으로 지구 대기에 나타난 것은 고원생대로, 혐기성 생물(세균 및 고균)의 물질 대사 과정의 부산물로 만들어졌다. 유리 산소의 증가는 그 당시 대부분의 생물들을 죽음으로 몰아 갔으나, 반대로 산소를 이용하는 새로운 생물이 등장하는 계기가 되었다. 또한 오존층의 형성으로 육상생물이 등장하는 계기도 마련해주었다. 산소는 대부분 광합성 작용으로 만들어지는데, 약 4분의 3은 대양의 식물성 플랑크톤과 조류가, 나머지 4분의 1은 육상 식물이 만든다. 사람에게도 생명활동에 꼭 필요한 물질로써, 산소가 결핍되면 5분이 지나 뇌사 상태에 빠지고 8분 뒤면 사망한다. 사람을 비롯한 동물군의 체내에서 산소를 운반하는 것은 적혈구의 주요 역할이다. Zuurstof is een chemisch element met symbool O (Uit het Latijn: oxygenium) en atoomnummer 8. Het is een niet-metaal dat tot de zuurstofgroep (groep VIa of groep 16) in het periodiek systeem behoort. Zuurstof komt als enkelvoudige stof vooral als dizuurstof (O2) in de atmosfeer voor. In samengestelde vorm is het eveneens een wijdverspreid element omdat alle water van de oceanen en alle silicaten waar de aardkorst uit bestaat zuurstof bevatten. Gemeten naar massa is zuurstof veruit het meest voorkomende element in het menselijk lichaam: dat bestaat voor ongeveer 65% uit zuurstof (voornamelijk als bouwsteen van water). Als gas is zuurstof kleurloos, geurloos en smaakloos. Als vloeistof is het lichtblauw. Kyslík (chemická značka O, latinsky Oxygenium) je plynný chemický prvek, tvořící druhou hlavní složku zemské atmosféry. Je biogenním prvkem a jeho přítomnost je nezbytná pro existenci většiny živých organismů na této planetě. Autorem jeho českého názvu je Jan Svatopluk Presl. Při dýchání vzduchu o obsahu kyslíku větším než 75 % (za normálního atmosférického tlaku) však dochází k většinou nenávratnému poškození plic. 酸素（さんそ、英: oxygen、羅: oxygenium、仏: oxygène、独: Sauerstoff）は、原子番号8の元素である。元素記号はO。原子量は16.00。第16族元素、第2周期元素のひとつ。 Is dúil cheimiceach í an ocsaigin a bhíonn le fáil go flúirseach san atmaisféar. Faoi na gnáth-imthoscaí, bíonn adaimh na hocsaigine ceangailte dá chéile ina móilíní dé-adamhacha. Is í an tsiombail cheimiceach atá aici ná O. Is é a hocht (8) an uimhir adamhach atá aici, agus is é an meáchan adamhach atá aici ná 15.999. Leis an teocht chaighdeánach agus faoin mbrú caighdeánach, is gás í an ocsaigin nach bhfuil boladh aisti ná dath inti. Dúil an-imoibríoch í an ocsaigin, agus mar sin, is dual di fanacht ceangailte do dhúile eile i gcomhdhúile ceimiceacha ar a dtugtar ocsaídí. Is í an ocsaigin an dara dúil is leictridhiúltaí amuigh, nó níl ach an fluairín níos fonnmhaire mar ghlacóir leictreon. Dá thoradh sin, tógann sé cuid mhaith fuinnimh an ocsaigin a shaoradh as na hocsaídí agus a aonrú, agus is fiú an cheist a chur, cén fáth a bhfuil an oiread sin ocsaigine san atmaisféar agus atá. Is é an freagra ná gurbh iad na baictéir agus na haircéabaictéir anaeróbacha sa Ré Phailéa- (2.5 billiún - 1.6 billiún bliain ó sin) a thál an ocsaigin sin mar sheachthoradh dá meitibileacht. Creidtear, fiú, gur ghlac an chuid ba mhó de na beothaigh a bhí ann san am sin leis an ocsaigin mar a bheadh nimh ann, agus gur thug an gás nimhe seo a mbás, fiú. An chuid ba mhó de na horgánaigh bheo a fágadh nó a forbraíodh ar dhroim an domhain ina dhiaidh sin, bhí siad ábalta leas a bhaint as an ocsaigin, an duine daonna san áireamh. Το οξυγόνο (αγγλικά: oxygen) είναι το χημικό στοιχείο με χημικό σύμβολο O και ατομικό αριθμό 8. Είναι ένα μέλος των χαλκογόνων. Είναι, ακόμη, ένα πολύ δραστικό αμέταλλο χημικό στοιχείο και ένα οξειδωτικό μέσο που γρήγορα σχηματίζει χημικές ενώσεις, συγκεκριμένα οξείδια, με τα περισσότερα άλλα χημικά στοιχεία. Κατά μάζα, το οξυγόνο είναι το 3ο σε χημικό στοιχείο στο σύμπαν, δηλαδή αμέσως μετά το υδρογόνο και το ήλιο. Δύο άτομα οξυγόνου ενώνονται για να σχηματίσουν «διοξυγόνο», δηλαδή μια διατομική αλλομορφή του στοιχειακού οξυγόνου, που όταν είναι χημικά καθαρό και υπό κανονικές συνθήκες, είναι ένα αέριο άχρωμο, άοσμο και άγευστο, με μοριακό τύπο O2. Πολλές μεγάλες κατηγορίες οργανικών μορίων σε ζωντανούς οργανισμούς, όπως πρωτεΐνες, νουκλεϊκά οξέα, υδατάνθρακες και λίπη, περιέχουν οξυγόνο, όπως επίσης συμβαίνει και με μεγάλης σημασίας ανόργανες ενώσεις (όπως για παράδειγμα το φωσφορικό οξύ) που αποτελούν συστατικά ζωικών εξωσκελετών, δοντιών και οστών. Άλλωστε, το μεγαλύτερο ποσοστό της μάζας των ζωντανών οργανισμών αποτελείται από οξυγόνο, ως κύριο μέρος της μάζας του νερού, που περιέχουν ως κυριότερο συστατικό τους οι μορφές ζωής. Για παράδειγμα, το ανθρώπινο σώμα αποτελείται κατά τα 2/3 της μάζας του από οξυγόνο. Το στοιχειακό οξυγόνο στη Γη παράγεται από κυανοβακτήρια, φύκη και φυτά, και χρησιμοποιείται από όλη τη σύνθετη ζωή του πλανήτη για την κυτταρική αναπνοή. Το οξυγόνο είναι τοξικό για τους , που κυριαρχούσαν στη Γη κατά τα αρχικά στάδια της γέννησης και ανάπτυξης του φαινομένου της ζωής στον πλανήτη μας, πριν το στοιχειακό διοξυγόνο αρχίσει να συσσωρεύεται στην ατμόσφαιρα, δηλαδή περίπου πριν από 2,5 δισεκατομμύρια χρόνια πριν από σήμερα (δείτε το λήμμα ). Η ζωή είχε αρχίσει να εμφανίζεται στη Γη πριν από περίπου 1 δισεκατομμύρια χρόνια. Το διατομικό αέριο οξυγόνο αποτελεί το 20,8% κατ' όγκο του ατμοσφαιρικού αέρα της Γης. Το οξυγόνο είναι το πιο άφθονο χημικό στοιχείο κατά μάζα, κυρίως ως διοξείδιο του πυριτίου (SiO2), του φλοιού της Γης, αποτελώντας συνολικά σχεδόν το ήμισυ της μάζας του. Το οξυγόνο αποτελεί σημαντικό τμήμα της ατμόσφαιρας της Γης και είναι απαραίτητο για τη διατήρηση του μεγαλύτερου μέρους της γήινης ζωής, καθώς χρησιμοποιείται από την αναπνοή. Ωστόσο, είναι πολύ δραστικό χημικά για να παραμείνει ως ελεύθερο στοιχείο στην ατμόσφαιρα του πλανήτη μας χωρίς τη συνεχή αναπλήρωσή του από τη φωτοσυνθετική δραστηριότητα ζωντανών οργανισμών (συγκεκριμένα των φυτών), που χρησιμοποιούν την ενέργεια του ηλιακού φωτός για να παράγουν στοιχειακό υγρό από το νερό. Μια άλλη αλλομορφή του οξυγόνου, το όζον (O3) απορροφά ισχυρά την UVB ακτινοβολία και συνεπώς το στρατοσφαιρικό στρώμα του όζοντος βοηθά την προστασία της βιόσφαιρας από την υπεριώδη ακτινοβολία, αλλά αντίθετα το τροποσφαιρικό όζον αποτελεί ρύπο κοντά στην επιφάνεια της Γης, αποτελώντας συστατικό της αιθαλομίχλης. Σε ακόμη μεγαλύτερα υψόμετρα από τη στρατόσφαιρα, η αλλομορφή του ατομικού οξυγόνου έχει σημαντική παρουσία και προκαλεί τη διάβρωση διαστημοπλοίων. Το οξυγόνο ανακαλύφθηκε, ανεξάρτητα, από τους (Carl Wilhelm Scheele), στην Ουψάλα το 1773, ή λίγο νωρίτερα, και τον Τζόζεφ Πρίστλυ (Joseph Priestley), στο (Wiltshire) το 1774, αλλά ο δεύτερος δημοσίευσε πρώτος την εργασία του. Το όνομα «οξυγόνο» δόθηκε το 1777 από τον Λαβουαζιέ. Τα πειράματα του τελευταίου διέλυσαν την τότε δημοφιλή θεωρία του φλογιστού για την καύση και τη διάβρωση. Η ονομασία «οξυγόνο» προήλθε από τις ελληνικές λέξεις «ὀξύ» + «γεννῶ», γιατί κατά την εποχή της ονοματοδοσίας του επικρατούσε η εσφαλμένη ιδέα ότι τα οξέα χρειάζονται οξυγόνο για να πραγματοποιήσουν τις χαρακτηριστικές τους αντιδράσεις διάβρωσης. Το οξυγόνο παράγεται βιομηχανικά με κλασματική απόσταξη υγροποιημένου (ατμοσφαιρικού) αέρα, με τη χρήση ζεολίθων με κυκλική συμπίεση για τη συγκέντρωση οξυγόνου από τον αέρα, με ηλεκτρόλυση του νερού, και ενίοτε με άλλους τρόπους. Η χρήση στοιχειακού οξυγόνου περιλαμβάνει την παραγωγή χάλυβα, πλαστικών, υφασμάτων, επεξεργασία μετάλλων, προώθηση πυραύλων, οξυγονοθεραπεία, συστήματα υποστήριξης ζωής σε αεροσκάφη, υποβρύχια, διαστημόπλοια και δύτες. Η εμπορική κατανάλωση οξυγόνου στις Η.Π.Α. υπερβαίνει τους 20 εκατομμύρια τόνους ετησίως. Ο εμπλουτισμός με οξυγόνο των υψικαμίνων στις χαλυβουργίες αντιπροσωπεύει τη μεγαλύτερη βιομηχανική χρήση του φυσικού αερίου. Μεγάλες ποσότητες χρησιμοποιούνται επίσης στην παρασκευή μίγματος αερίων κατά την παραγωγή αμμωνίας και μεθανόλης, καθώς και για οξυ-ακετυλενικές συγκολλήσεις. Στα νοσοκομεία συχνά χρησιμοποιείται για την ενίσχυση της αναπνοής των ασθενών. Το φυσικό οξυγόνο αποτελείται από τρία (3) σταθερά ισότοπα: το 16Ο (σε ποσοστό 99,762 %), το 17Ο και το 18O.
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Medicine Chemistry
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Chalcogens Chemical elements Period 2 elements Oxygen
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Wikijunior:The Elements/Oxygen
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Oxygen atom
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