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Calcium (Ca), one of the major chemical elements has an atomic number 20 and is the fifth element as well as the third most ample metal in the earthâs crust. It comes with less chemically reactivity in comparison with alkaline metals as well as other alkaline-earth metals. The element is an extremely ductile silvery metal that comes with a pale yellow shade whose phyical properties are much kindred to the heavier elements in its grouping such as, strontium, radium and barium. In its contact with air, Calcium evolves into a nitride coating and an oxide, which give protection from further corrosion.