Chemistry - Atomic Structure Question with Solution | TestHub

The electronic configuration of N-atom is $1s^{2}2s^{2}2p^3$. According to Hund's rule, the three electrons in the $2p$ subshell are unpaired. Spin multiplicity is given by $2S+1$, where $S$ is the total spin. For N, $S=3\times (\frac{1}{2})=\frac{3}{2}$. Thus, spin multiplicity $=2(\frac{3}{2})+1=3+1=4$.