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Question

Chemistry Question on Classification of elements & periodicity in properties

Which one of the following ions will be smallest in size?

A

Na+^+

B

Mg2+^{2+}

C

F^-

D

O2O^{-}_2

Answer

Mg2+^{2+}

Explanation

Solution

Na+,Mg2+,O2andF^+, Mg^{2+}, O^{ 2-} \, and \, F^- all are isoelectronic but Mg2+^{2+} have 12 protons in his nucleus, so the attraction force on last shell is maximum and hence it have smallest size.