A) \[{{F}^{-}}\]
B) \[{{O}^{-2}}\]
C) \[A{{l}^{+3}}\]
D) \[{{N}^{-3}}\]
Correct Answer: D
Solution :
Due to having three electrons atomic size increases. \[{{F}^{-}}=9+1=10\] electrons ; \[{{O}^{-2}}=8+2=10\] electrons \[Al+3=13-3=10\] electrons ; \[{{N}^{3-}}=7+3=10\,{{e}^{-}}.\] Because electrostatic force between nucleus and \[\bar{e}\] cloud is least in nitrogen.
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