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Question

The element with the smallest size in group 13 is:

A
beryllium
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B
gallium
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C
aluminium
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D
boron
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Solution

The correct option is D boron
The element with the smallest size in group 13 is boron.
In a group, on moving from top to bottom, the atomic size increases as additional shells of electrons are added.
Group 13 elements (from top to bottom) include B, Al, Ga, In, and Tl.

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