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Molecular orbital diagram of CO, NO, and O2. The three MO energy schemes are equivalent, where in the case of O2, the order of the bonding σ2p and π2p states is inverted due to a decreased influence of the 2s states. The antibonding orbital π2p* is filled with, respectively, 0, 1, and 2 electrons, creating the triplet ground state for O2.
