The explanation for the presence of three unpaired electrons in the nitrogen atom can be given by -

Options

A. Pauli's exclusions principle
B. Hund's rule
C. Aufbau's principle
D. Uncertainty principle

Answer

B

Explanation

`Cr = 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1) " ", Mn^(+) = 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(5)4s^(1)`
i.e. it represent both ground state and cationic form.