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Oxygen

Chemical element
Oxygen is a chemical element; it has symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other... Wikipedia
Symbol: O
Atomic mass: 15.999 u
Atomic number: 8
Electron configuration: [He] 2s² 2p⁴
Discovered: 1774
Number of electrons: 8 electrons