9.7 Molecular Orbital (MO)Theory Electron configuration of quantized MO: Lowest energy rule ---Lowest energy level fills first Pauli's Exclusion Principle ---2e maximum per orbital Hund's rule --For degenerate orbitals 1 electron in each orbital before double-up!9.7 Molecular Orbital (MO) Theory Lowest energy rule --- Lowest energy level fills Lowest energy level fills first Electron configuration of quantized MO : Pauli’s Exclusion Principle --- 2e maximum per 2e maximum per orbital Hund’s rule --- For degenerate orbitals : 1 electron in each orbital before double electron in each orbital before double-up!