Question

What is the electron configuration of calcium?

Answer 1

`Ca: [Ar] 4s^2`

Explanation:

Calcium has an atomic number of 20. Simply use this information to obtain its electronic configuration. Thus, `Ca: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2` or simply `Ca: [Ar] 4s^2`.