Which of the following configuration is incorrect ?

Options

A. `1s^(2)2s^(2)2p_(x)^(2)2p_(y)^(2)2p_(z)^(0)`
B. `1s^(2)2s^(2)2p_(x)^(1)2p_(y)^(1)2p_(z)^(0)`
C. `1s^(2)2s^(2)2p_(x)^(1)2p_(y)^(1)2p_(z)^(1)`
D. `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`

Answer

A

Explanation

It goes against Hund's rule.