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$\mathrm{Na}^{+}$ion is isoelectronic with
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$M g^{+2}$
Electrons in $\mathrm{Na}^{+}=11-1=10$
Electrons in $\mathrm{Mg}^{2+}=12-2=10$
Electrons in $\mathrm{Mg}^{2+}=12-2=10$
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