The number of molecular orbitals (MOs) formed is always equal to the number of atomic orbitals combined.
1.The more stable the bonding MO, the less stable the corresponding antibonding MO.
2.The filling of MOs proceeds from low to high energies.
3.Each MO can accommodate up to two electrons.
4.Use Hund’s rule when adding electrons to MOs of the same energy.
5.The number of electrons in the MOs is equal to the sum of all the electrons on the bonding atoms.
Molecular Orbital (MO) Configurations