Paramagnetism and Diamagnetism
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A molecule with unpaired electrons in its molecular orbitals is paramagnetic, weakly drawn into a magnetic field; one with every electron paired is diamagnetic, weakly repelled.
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A molecule whose highest filled orbitals hold two unpaired electrons is drawn slightly into an external magnetic field.
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This behavior is set by unpaired electrons in molecular orbitals specifically, unrelated to a molecule's overall charge.