electrons fill lower-energy orbitals before higher-energy orbitals one electron a single electron will occupy degenerate orbitals before pairing According to Pauli's principle, This means that each atomic orbital can hold at most Since each molecular orbital can hold apply to molecular orbitals. number of electrons, Pauli's principle

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Quantum Mechanical Treatment of the Valence Bond Theory

Quantum mechanical treatment of valence bond theory refers to the relationship established between the quantum mechanical theory and the valence bond theory to describe the chemical bonding in a particular molecule.