Gas that makes up 21% of the atmosphere
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Oxygen is the gas that makes up 21% of the atmosphere.
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I think Oxygen.
Oxygen is 20.95% present in Air or atmosphere.
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
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