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NEET levelSingle correct optionDifficulty 1 of 3pt065

Which of the following species has the largest radius?

A $Na X^{+}$
B $N X^{3 -}$
C $F X^{-}$
D $O X^{2 -}$

Answer: B

All four are isoelectronic (

10

electrons). With the fewest protons,

N X^{3 -}

has the lowest

Z_{eff}

and hence the largest radius.

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