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Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth-most-abundant element by mass in the Earth 's crust. The ion Ca 2+ is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.Free calcium metal is too reactive to occur in nature.n chemical terms, calcium is reactive and soft for a metal; though harder than lead, it can be cut with a knife with difficulty. It is a silvery metallic element that must be extracted by electrolysis from a fused salt like calcium chloride.
Definition of Calcium. It is the most abundant mineral in the human body. About 99% is present in bones and teeth, and the remainder in blood, muscles and nerves. Classification is the term for te hardening of bones and teeth. This is due to the absorption of calcium and phosphorus (calcium phosphate). Sources of Calcium.