Molecular Orbital Theory: After the failure of the valence bond approach to explaining the Para-magnetism in O2 molecule and also to explain the formation of odd electron species like H2+, another theory was proposed known as Molecular orbital theory. R.S.Muliken and F.Hund proposed this theory in 1932. The basic idea of this theory is that atomic orbitals of individual atoms combine to form the molecular orbitals. This is also known as the united atom approach. The main features of this theory are as under- This theory regards the molecule as a single unit in which all the electrons are shared … Continue reading Molecular Orbital Theory