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Question

Question: The size of the following species increases in the order:...

The size of the following species increases in the order:

A

Mg2+^{2+} < Na+^+ < F^-

B

F^- < Na+^+ < Mg2+^{2+}

C

Mg2+^{2+} < F^- < Na+^+

D

Na+^+ < F^- < Mg2+^{2+}

Answer

(A) Mg2+^{2+} < Na+^+ < F^-

Explanation

Solution

For isoelectronic species, size decreases as nuclear charge increases. F^- (Z=9), Na+^+ (Z=11), Mg2+^{2+} (Z=12) all have 10 electrons. Therefore, Mg2+^{2+} < Na+^+ < F^-.