Which of the following electronic configuration is not possible according to Hund's rule?

Options

A. `1s^(2) 2s^(2)`
B. `1s^(2) 2s^(1)`
C. `1s^(2) 2s^(2) 2p_(x)^(1) 2p_(y)^(1) 2p_(z)^(1)`
D. `s^(2) 2s^(2) 2p_(x)^(2)`

Answer

D

Explanation

The configuration `1s^(2) 2s^(2) 2p_(x)^(2)` is not correct according to Hund's rule.