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The correct order of atomic radii in group 13 elements is:

1. B < Al < In < Ga < Tl
2. B < Al < Ga < In < Tl
3. B < Ga < Al < In < Tl
4. B < Ga < Al < Tl < In

Correct answer: B < Al < Ga < In < Tl

Solution

In group 13, atomic radii generally increase down the group. However, Ga is slightly smaller than Al due to the poor shielding effect of d-electrons in Ga. Thus, the correct order is B < Al < Ga < In < Tl.

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