Francis, Arthur W., Sr. Formerly, Union Carbide Corporation, Tarrytown, New York.
Sayre, Lawrence M. Department of Chemistry, Case Western Reserve University, Cleveland, Ohio.
Last reviewed:January 2020
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A gaseous chemical element, O, atomic number 8, and atomic weight 15.9994. Oxygen is of great interest because it is the essential element both in the respiration process in most living cells and in combustion processes. It is the most abundant element in the Earth's crust. About one-fifth (by volume) of the air is oxygen. See also: Periodic table
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