The fact that the valence orbital configuration of nitrogen in the ground state is 2s2, 2px12py12pz1 is an illustration of:

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Hund's Rule states that, for atoms with multiple orbitals at the same energy level, electrons will fill each orbital with one electron before pairing up. This results in the valence orbital configuration of nitrogen being 2s2, 2px1 2py1 2pz1, rather than 2s2, 2px2 2py0 2pz0.

The Fact That the Valence Orbital Configuration of Nitrogen in the Ground