A) \[N<Be<B~\]
B) \[{{F}^{-}}<{{O}^{2}}-<\text{ }{{N}^{3-}}\]
C) \[Na<Li<K~\]
D) \[F{{e}^{2+}}\,<F{{e}^{2-}}<F{{e}^{4+}}\]
Correct Answer: B
Solution :
[b]\[~{{F}^{-}}<{{O}^{2-}}<{{N}^{3-}}\] Ionic radii: \[{{F}^{-}}=136\] \[{{O}^{2-}}=140\] \[{{N}^{3-}}=285\]
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