According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic.

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Molecular orbital theory suggests that whether a diatomic molecule is diamagnetic or paramagnetic depends on the electron configuration in its molecular orbitals. If all electrons are paired, the molecule is diamagnetic; if there are unpaired electrons, it is paramagnetic. This is not solely determined by having an even number of electrons.

According to Molecular Orbital Theory, All Diatomic Molecules with an Even