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The increasing order of atomic radii of the following Group 13 elements is

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$Al < Ga < In < Tl$

$Ga < Al < In < Tl$

$Al < In < Ga < Tl$

$Al < Ga < Tl < In$

answer is B.

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Detailed Solution

Increasing order of atomic radius of group 13 elements Ga < Al < In < TI. Due to poor shielding of d-electrons in Ga, its radius decreases below AI.

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