Calcium belongs to the chemical elements belonging to Group 2A i.e. Alkaline Earth Metals. Strontium, Beryllium, Magnesium and Radium are other members of group II of the periodic table. The periodic table is an ordered arrangement of chemical elements in groups and periods to better understand their behavior in the form of groups. Occurrence of Calcium: Calcium never occurs as a free element in the nature but it is found in the earth’s crust as sulfate, carbonate, silicate, fluoride and borate. The most common of all i.e. calcium carbonate is usually found in chalk, marble, and so on. Calcium mainly
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