Calcium is a mineral your body needs to build and maintain strong bones and to carry out many important functions. Calcium is the most abundant mineral in the body. Almost all calcium in the body is stored in bones and teeth, giving them structure and hardness.
Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Wikipedia
Symbol: Ca
Atomic mass: 40.078 u
Atomic number: 20
Electron configuration: [Ar] 4s²
Appearance: dull gray, silver; with a pale yellow tint
Density (near r.t.): 1.55 g/cm3
Group: group 2 (alkaline earth metals)
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