HUMAN NUTRITION

Detailed explanation-1: -Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.

Detailed explanation-2: -Calcium is a chemical element with symbol Ca and atomic number 20.

Detailed explanation-3: -Calcium was named after the Latin term calx meaning lime, and is a reactive silvery metallic element found in Group 2 of the periodic table. It was first isolated in 1808 in England when Sir Humphry Davy electrolyzed a mixture of lime and mercuric oxide.

Detailed explanation-4: -calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table.