Which electronic configuration for oxygen is correct according to Hund's rule of multiplicity.

Options

A. `1 s^2, 2 s^2 2 p^(2)._(x) 2 p^(1)._(y) 2 p^(1)._(z)`
B. `1 s^2, 2 s^2 p^(2)._(x) 2p^(2)._(y) 2 p^(0)._(z)`
C. `1s^2, 2 s^(2) 2p^(3)._(x) 3 p^(1)._(y) 2 p^(0) ._(z)`
D. None of these

Answer

A

Explanation

(a) Hund's rule states that pairing of electron in the orbitals of a subshell (orbitals of equal energy) status when each of them us singly filled.