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Cobalt (Co) has 27 electrons. In its most common oxidation state, Co(II), the cobalt ion has 25 electrons. The electron configuration of Co(II) is [Ar]3d7. This means it has 3 unpaired electrons, making it paramagnetic. To determine the diamagnetic correction, one would need to consider the specific compound or complex containing Co(II) and the magnetic susceptibility of the ligands.