Question

Explain how valence bond theory differs from the Lewis concept.

Answer 1

The Lewis concept describes the formation of bond in terms of sharing one or more electron pairs and the octet rule.

It does not explain the energetics of the bond formation, and shapes of the polyatomic molecules.

The valence bond theory describes the bond formation in terms of hybridization and overlap of the orbitals.

The overlap of orbitals along the internuclear axis increases the electron-density between the two nuclei resulting in a decrease in the energy and formation of a bond.