Define valence bond theory
Answers
Answer:
Valence bond theory considers that the overlapping atomic orbitals of the participating atoms form a chemical bond. Because of the overlapping, it is most probable that electrons should be in the bond region. Valence bond theory views bonds as weakly coupled orbitals (small overlap).
According to Valency Bond theory :
1. Electrons present in the molecule are localised as if they are in isolated atoms.
2.The Atomic orbitals of the combining atoms retain their individual identity.
3. It involves only the increase in the electron density in the region of orbital overlap.
4.The number of covalent bonds formed is equal to the number of combining orbitals.
5.This theory doesn't help in predicting the paramagnetic or diamagnetic behaviour of molecules.
6. It is easy to apply.
7. In this theory resonance is considered.