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There are several known allotropes of oxygen. The most familiar is oxygen (O2), present at significant levels in Earth's atmosphere and also known as dioxygen or triplet oxygen. Another is the highly reactive ozone (O3). Others include: *Atomic oxygen (O1, a free radical). *Singlet oxygen (O2 *), either of two metastable states of molecular oxygen. *Tetraoxygen (O4), another metastable form. *Solid oxygen, existing in six variously colored phases, of which one is and another one metallic. ==Atomic oxygen== Atomic oxygen, denoted O(3P), O(3P) or O((3)P),〔 is very reactive, as the single atoms of oxygen tend to quickly bond with nearby molecules; on Earth's surface it does not exist naturally for very long, though in outer space, the presence of plenty of ultraviolet radiation results in a low Earth orbit atmosphere in which 96% of the oxygen occurs in atomic form.〔 Ryan D. McCulla, Saint Louis University (2010). ("Atomic Oxygen O(3P): Photogeneration and Reactions with Biomolecules" ). 〕〔 ("Out of Thin Air" ). NASA.gov. February 17, 2011. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Allotropes of oxygen」の詳細全文を読む スポンサード リンク
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