Riley, Reed F. Quantum Electronics Group, General Telephone and Electronics, Bayside, New York.
Last reviewed:May 2019
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A chemical element, Ca, of atomic number 20, atomic weight 40.078. Calcium—the fifth most abundant element in the Earth's crust and the third among metals—is a member of the alkaline-earth metals of group 2 of the periodic table. It is the most abundant mineral in the human body, with calcium phosphate found in the bones and teeth. In addition, calcium is essential for the functioning of nerves and muscles. See also: Alkaline-earth metals; Periodic table
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