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Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table. It is a highly reactive nonmetal and an oxidizing agent. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Diatomic oxygen gas constitutes 20.8% of the Earth's atmosphere. Oxygen was discovered independently by Carl Wilhelm Scheele in 1773 and Joseph Priestley in 1774. The name oxygen was coined in 1777 by Antoine Lavoisier.
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