1. The electrons in an atom are found in atomic orbitals, the electrons in a molecule are found in molecular orbitals.
2. The molecular orbitals are formed by the combination of atomic orbitals of comparable energies and proper symmetry.
3. The BMO has lower energy and hence greater stability than the corresponding ABMO.
4. The molecular orbitals are filled by electrons in accordance with Aufbau principle, Pauli’s exclusion principle and the Hund’s rule
