# 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

∴ Spin multiplicity = 2S + 1

where

$$S = 3\times \frac{1}{2} + 1$$

Spin multiplicity = 2 × 3/2 + 1

Spin multiplicity = 3 + 1

Spin multiplicity = 4

Therefore, spin multiplicity of nitrogen = 4