The correct order of atomic radii in group 13 elements is

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$B < Al < Ga < In < Tl$

$B < G a < A l < I n < T l$

$B < Ga < Al < Tl < In$

$B < Al < In < Ga < Tl$

answer is D.

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Detailed Solution

In III group, from top to bottom, atomic size gradually increases due to increase in atomic number, and electrons enters into new shell. So, the order is B < Al < Ga < In < Tl. However, actual order is B < Ga < Al < In < Tl
due to poor shielding effect of d-orbitals in Ga. So, atomic radii of Ga is less than Al.
(1) B < Al < In < Ga < Tl - Density order In third group, boron has lowest atomic radii and lowest density.

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