Question

what is calcium?????? ​

Answer 1

Explanation:

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. Its physical and chemical properties are most similar to its heavier homologues strontium and barium

Answer 2

Here is your answer+explanation

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. Its physical and chemical properties are most similar to its heavier homologues strontium and barium.

Symbol: Ca

Atomic mass: 40.078 u

Atomic number: 20

Electron configuration: [Ar] 4s²

Van der Waals radius: 231 pm

Discoverer: Humphry Davy