Calcium

:See also Calcium, New York, United States.

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Calcium is a chemical element in the periodic table that has the symbol Ca and atomic number 20. Calcium is a soft grey alkaline earth metal that is used as a reducing agent in the extraction of thorium, zirconium and uranium. Calcium is also the fifth most abundant element in the earth's crust. It is essential for living organisms, particularly in cell physiology.

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Calcium is a rather soft metallic element that is purified by electrolysis from calcium fluoride. It burns with a yellow-red flame and forms a white nitride coating when exposed to air. It reacts with water displacing hydrogen and forming calcium hydroxide.

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Calcium, New York: Calcium is a hamlet (and census-designated place) located in Jefferson County, New York, USA. As of the 2000 census, the hamlet had a total population of 3,346....

United States: :For other uses, see US (disambiguation), USA (disambiguation), and United States (disambiguation)....

Chemical element: A chemical element, often called simply element, is the class of atoms which contain the same number of protons....