Calcium (Ca) is a chemical element with atomic number (Z) 20, group 2, period 4, and atomic weight 40.078. The Calcium (Ca) is the fifth element and the third most abundant metal in the Earth’s crust that is trimorphic metal, harder than sodium, but softer than aluminium, used in aluminium alloys for bearings, as a helper in the bismuth removal form lead, as well as in controlling graphitic carbon in melted iron. The Calcium is produced in supernova nucleosynthesis. (Refer to the Chemical Element; Periodic Table)
