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Which one of the following has largest ionic radius ?

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B³⁺

F^-

Li⁺

$O^{- 2}$

answer is B.

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Detailed Solution

This can be explained on the basis of z/e{nuclear charge/no. of electrons}, as z/e ratio increases, the size decreases and when z/e ratio decreases the size increases

For Li⁺, z/e=3/2=1.5

For B³⁺, z/e=5/2=2.5

For O²⁻, z/e=8/10=0.8

For F⁻, z/e=9/10=0.9

Hence, O²⁻ has highest value of ionic radius.

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