- Calcium is a silvery-white, soft metal that tarnishes rapidly in air and reacts with water. Calcium metal is used as a reducing agent in preparing other metals such as thorium and uranium. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys.
Explanation:
calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. ... It is the fifth most abundant element in Earth's crust and the third most abundant metal, after iron and aluminium.
