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Q.

Which of the following has smallest radius?

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a

F–

b

Be2+

c

Li+

d

O2–

answer is A.

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Detailed Solution

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Species with lower no. of electrons is smaller than higher no. of electrons.

Among the given options Be+2 and Li+(2 electrons) have lower no. of electrons.

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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