# Spin Multiplicity of Nitrogen in the Ground State

Multiplicity is defined as the energy level at 2S+1 where S is the total spin angular momentum. When the multiplicity is 1, 2, 3, 4, 5 they are termed as singlets, doublets, triplets, quartets, and quintets respectively.

Nitrogen (z=7) ⇒ 1s2 2s2 2p3

[1 1 1] $S=3times frac{1}{2}$

Spin multiplicity = 2S + 1 = 2 ($S=3times frac{1}{2}$) + 1

Therefore, spin multiplicity of nitrogen = 4