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# $Mg^{2+}$ is isoelectronic with

$\begin{array}{1 1}(a)\; Ca^{2+} \\ (b)\; Na^{+} \\ (c)\;Zn^{2+} \\ (d)\;Cu^{2+} \end{array}$

Hence $Mg^{2+}$ and $Na^{+}$ have 10 electrons