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$\mathrm{Mg}^{2+}$ is isoelectronic with
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$\mathrm{Na}^{+}$
Number of electrons in Mgy $=12$
Number of electrons in $\mathrm{Mg}^{2+}=10$
Number of electrons in $\mathrm{Na}^{+}=10$
$\therefore \mathrm{Mg}^{2+}$ is isoelectronic with $\mathrm{Na}^{+}$.
Number of electrons in $\mathrm{Mg}^{2+}=10$
Number of electrons in $\mathrm{Na}^{+}=10$
$\therefore \mathrm{Mg}^{2+}$ is isoelectronic with $\mathrm{Na}^{+}$.
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