Question

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Diagram of o2,n2,cl2 according to valence bond theory please explain

Answer 1

hope if these images could help.

Answer 2

Here is the full molecular orbital diagram for N2. Now we add the 10 electrons, 5 from each nitrogen atom. Note that the bottom sigma symmetry orbital is strongly bonding, the top one is strongly antibonding, and the 2 in the middle are only weakly bonding and antibonding, respectively.