A) \[{{N}^{3-}}\]
B) \[{{O}^{2-}}\]
C) \[{{F}^{-}}\]
D) \[N{{a}^{+}}\]
Correct Answer: D
Solution :
\[N{{a}^{+}}<{{F}^{-}}<{{O}^{2-}}<{{N}^{3-}}\] All are isoelectronic, effective number charge is highest for \[N{{a}^{+}}\] so it has smallest size.
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