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N2 molecule has 14 electrons.
fig 1.19 - Molecular orbital energy level diagram for N
2 moleculeThe molecular orbital electronic configuration of the molecule is:
N2: KK(s2s)2 (s*2s)2 (p2px)2 (p2py)2 (s2pz)2
Thus, nitrogen molecule has three bonds, one s- and two p-bonds. This is in accordance with very high bond dissociation energy (945 kJ mol-1) and small bond length (110 pm) of the molecule. The molecule is diamagnetic because there are no unpaired electrons.
Comparison of N
2 and N2+ ion
This electron will be lost from
s2p
2 M.O.
Since bond order of N
2+ ion is less than the bond order of N
2 molecule, therefore the bond strength of N
2+ will be less than that of N
2 molecule and bond length of N
2+ will be more than that of N
2 molecule.
