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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.
Calcium forms several compounds in nature and many of these have a wide variety of uses. Some examples of calcium compounds include:1  Hydroxylapatite, formed from calcium and phosphate. 2  Calcium carbonate is used to make cement and mortar and also in the glass industry. 3  Calcium hydroxide, is used in the detection of carbon dioxide (CO2) as it turns cloudy in the presence of CO2. 4  Calcium carbide is a compound that is used in the 5  .... Calcalcium forms several compounds in nature and many of these have a wide variety of uses. Some examples of calcium compounds include: