Why the energy levels of molecular orbitals of B2, C2 and N2 are different?Explain.
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The combination of atomic orbitals takes place due to orbital-orbital interactions.
Due to these interactions, the energy level diagram gets modified. In case of atoms like boron, carbon and nitrogen the energy difference of 2s and 2p levels is quite small.
Due to close proximity of 2s and 2p orbitals, the orbitals undergo mixing interactions in view of which the energy of orbitals is raised and it becomes greater than which do not experience these intermixing interactions.
The molecules O2 and F2 do not exhibit these mixing interactions due to THE larger difference of energy between their 2s and 2pz orbitals which makes intermixing interactions insignificant.
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