Question
$Zn ^{2+}$ is diamagnetic while $Cu ^{2+}$ is paramagnetic, why?
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Answer
$Zn ^{+2}\left(3 d^{10}\right)$ does not have a single unpaired electron whereas $Cu ^{2+}\left(3 d^9\right)$ has one unpaired electron present, hence $Zn ^{2+}$ is diamagnetic but $Cu ^{2+}$ is paramagnetic.
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