uclei in the whole molecule . Molecular orbital theory assumes the wave nature of electrons ,thus during the overlapping the wave functions of different atoms interact in two ways- Destructive interference and constructive intereference. The molecules possesing higher number of bonding electrons are more stable.Molecular orbital theory is more powerful than valence-bond theory because the orbitals reflect the geometry of the molecule to which they are applied. But this power carries a significant cost in terms of the ease with which the model can be visualized.Basically molecular orbital (MO) theory is a method for determining molecular structure in which electrons are not assigned to individual bonds between atoms, but are treated as moving under the influence of the nuclei in the whole molecule.