Explain the formation of nitrogen molecule by molecular orbital theory (MOT) .


Nitrogen molecule (N2)

The electronic configuration of nitrogen (Z=7) = 1s2 2s2 2px12py12pz1.

The total number of electrons present in the nitrogen molecule (N2) is 14.

In order to maximize energy, these 14 electrons can be accommodated in the different molecular orbitals.

N2: KK (σ2s)2 (σ2s)2 (π2Px)2 (π2py)2 (σ2px)2 (π2py)2

Here (σ1s)2 (σ1s)2 part of the configuration is abbreviated as KK, which denotes the K shells of the two atoms. In calculating bond order, we can ignore KK, as it includes two bonding and two antibonding electrons.

The bond order of N2can be calculated as follows:

Here, Nb = 8 and Na = 2

Bond order = (Nb−Na) /2

B.O = (8−2)/2

B.O = 3

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