Comparison of VB and MO Theories

According to Leonard-Jones, there is a little difference in the two approaches of covalent bonds. In the real sense, each approach has a different utility under a given set of circumstances. Both theories can be compared by considering their similarities and differences. 

Both theories consider the formation of covalent bond to be due to overlap or combination of atomic orbitals. 

In both the theories the essential requirement is that the atomic orbital which overlap or combine should have nearly equal energies. 

Charge cloud is assumed to reside between the two nuclei or a large concentration of electron density between the two nuclei is assumed. 

In MO theory, the atomic orbitals lose their individuality whereas in VB theory, the inner atomic orbitals retain their individualities and only the outer orbitals are involved in bonding. 

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