Nitrogen Molecule (N2)


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N2 molecule has 14 electrons.

atomic orbital energy level diagram for nitrogen

Molecular orbital energy level diagram for N2 molecule

fig 1.19 - Molecular orbital energy level diagram for N2 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 s2p2 M.O.

electronic configuration of nitrogen 2 plus

bond order of nitrogen

Since bond order of N2+ ion is less than the bond order of N2 molecule, therefore the bond strength of N2+ will be less than that of N2 molecule and bond length of N2+ will be more than that of N2 molecule.


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