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'''Oxygen''' is a chemical [[element]]. Its atomic number, and hence the number of [[proton]]s and [[electron]]s it contains, is 8, and its atomic mass is slightly under 16, since it also has 8 [[neutron]]s (a slight amount of mass is "lost" in the energy contianed in the subatomic bonds).
'''Oxygen''' is a chemical [[element]]. Its atomic number, derived from number of [[proton]]s and [[electron]]s it contains, is 8. Oxygen's atomic mass is slightly under 16, since it also has 8 [[neutron]]s (a slight amount of mass is "lost" in the energy contianed in the subatomic bonds).
Under [[normal condition]]s it is a colorless, odorless [[gas]] consisting of two oxygen [[atom|atoms]] which has the chemical formula O<sub>2</sub>. This means it is diatomic. Approximately 20% of the [[atmosphere]] is made up of oxygen. Oxygen also forms a triatomic molecule called [[ozone]] (O<sub>3</sub>), which although unstable under normal conditions, is a very important ingredient in the upper atmosphere.
Under [[normal condition]]s it is a colorless, odorless [[gas]] consisting of two oxygen [[atom|atoms]] which has the chemical formula O<sub>2</sub>. This means it is diatomic. Approximately 20% of the [[atmosphere]] is made up of oxygen. Oxygen also forms a triatomic molecule called [[ozone]] (O<sub>3</sub>), which although unstable under normal conditions, is a very important ingredient in the upper atmosphere.