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Q.

Which of the following has smallest radius?

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a

O^-2

b

F^–

c

Be⁺²

d

Li⁺

answer is A.

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Detailed Solution

Cations with larger charge are smaller. While anions with larger charge have large atomic radii.

Here, Beryllium has the largest charge which makes it the smallest.

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Which of the following has smallest radius?