Bonding MO: the lowest energy• Antibonding MO: the highest energy• The highest energy orbital from amongthe occupied orbitals is called the HighestOccupied Molecular Orbital (HOMO)• The lowest energy orbital from among theunoccupied orbitals is called the LowestUnoccupied Molecular Orbital (LUMO).• The number of MOs created must beequal to the number of AOs that wereused.