Which is smallest in size [RPMT 1997]

1.	Which is smallest in size [RPMT 1997]
A.	\[{{O}^{2-}}\]
B.	\[{{C}^{4-}}\]
C.	\[{{F}^{-}}\]
D.	\[{{N}^{3-}}\]
Answer» D. \[{{N}^{3-}}\]

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Which is smallest in size [RPMT 1997]

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