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calcium: Quick Facts

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Taking calcium and vitamin D may not prevent broken bones • Nov. 2, 2026, 2:00 PM ET (Washington Post)

Facts

Also Known As Ca

Photos and Videos

A labeled diagram of the periodic table entry for calcium, showing its atomic number 20, symbol Ca, atomic weight 40.078, electron configuration, and classification as an alkaline-earth metal. Icons indicate calcium is a solid with a face-centered cubic crystal structure and strongly basic oxides at room temperature.
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Key People

Sir Humphry Davy
Sir Humphry Davy
English chemist
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Johann Wolfgang Döbereiner
German chemist

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