Question

what is the atomic number of calcium ​

Answer 1

Answer:

atomic number of calcium is 20

Answer 2

Answer:

20

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.