Write the increasing order of energies of molecular orbitals in various diatomic molecules of second row elements.

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The increasing order of energies of molecular orbitals for molecules (except O2 and F2) is :

σ1s < σ*1s < σ2s < σ*2s < (π2px = π2py) < σ2pz < (π*2px = π*2py) < σ*2pz

The increasing order of energy of molecular orbitals for diatomic molecules like O2 and F2 is :

σ1s < σ*1s < σ2s < σ*2s < σ2pz < (π2px = π2py) < (π*2p = π*2py) < σ*2pz

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