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Oxygen is a chemical [[element]] vital for life. Under normal conditions it is a colorless odorless [[gas]] consisting of two oxygen [[atom]]s which has the chemical formula O2.
Oxygen is a chemical [[element]] vital for life. Under normal conditions it is a colorless odorless [[gas]] consisting of two oxygen [[atom|atoms]] which has the chemical formula O<sub>2</sub>.
Approximately 20% of the [[atmosphere]] is made up of oxygen.
Approximately 20% of the [[atmosphere]] is made up of oxygen.
[[Category:Science]]
[[Category:Chemistry]]
[[Category:Elements]]