According to molecular orbital theory, all diatomic molecules with an even number of electrons are 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. A molecule is diamagnetic if all its electrons are paired, but if it has unpaired electrons, it is paramagnetic. This can occur in molecules with both even and odd numbers of electrons.

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