Which of the following has the smallest size?

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(D) All the given ions are isoelectronic,having $10$ electrons each $(1s^2 2s^2 2p^6)$.For isoelectronic species,the ionic radius decreases as the nuc

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$P^{5+}$

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(D) All the given ions are isoelectronic,having $10$ electrons each $(1s^2 2s^2 2p^6)$.For isoelectronic species,the ionic radius decreases as the nuclear charge (atomic number) increases.The atomic numbers are: $Na (11)$,$Mg (12)$,$Al (13)$,and $P (15)$.Since $P^{5+}$ has the highest nuclear charge $(Z = 15)$,it exerts the strongest attraction on the electrons,resulting in the smallest ionic size.Therefore,the correct option is $(D)$.

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