A paramagnetic ion has unpaired electrons. While a diamagnetic ion do not have unpaired electrons.
Metal ions
Metal ions are formed when electrons are lost from metal atoms to for a specie that has a positive charge.
For Mg^2+, the shorthand configuration is [Ne], there are no unpaired electrons present. The ion is diamagnetic and one of its compound is MgCl2.
For Cr^2, the shorthand configuration is [Ar]3d4, there are four unpaired electrons present and the ion is paramagnetic. An ionic compound formed is CrCl2.
For Pd^2+, the shorthand configuration is [Kr]4d8, there are two unpaired electrons. The ion is paramagnetic and a compound formed is PdCl2.
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