Which one of the following pairs of atoms/atom-ion have identical ground state configuration?

Options

A. `Li^(+)` and `He^(+)`
B. `Cl^(-)` and Ar
C. Na and K
D. `F^(+)` and Ne.

Answer

B

Explanation

Configuration of `Cl^(-)` and Ar is same `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6)`.