A) \[N{{a}^{+}}\]
B) \[{{O}^{2-}}\]
C) \[{{N}^{3-}}\]
D) \[Z{{n}^{2+}}\]
Correct Answer: C
Solution :
All the ions are isoelectronic but they have different size due ot different values of Z. In \[N{{a}^{+}},{{O}^{2-}},{{N}^{3-}},{{F}^{-}},\]number of electrons are 10 but, \[r\propto \frac{1}{Z}\]. Thus greater the value of\[\frac{e}{Z}\]greater the size of iso-electronic species. Hence\[{{N}^{3-}}\]is largest in size.
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