Question

Why calcium is found in the form of a compound

Answer 1

Calcium is very active element that can easily reacts with some elements and cannot be found as a element.

Answer 2

Although calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO).