Electronic configuration calcium atom can be written as

Options

A. [Ne] `4p^(2)`
B. [Ar] `4s^(2)`
C. [Ne]`4s^(2)`
D. [Kr]`4p^(2)`

Answer

B

Explanation

(b) To write the electronic configuration of an atom, it is better if we remember the atomic number of noble gases and the orbitals follow the noble gas. The atomic number of Ca is 20 and its nearest noble gas is argon (Ar = 18).