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Q.

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

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a

Al<Ga<In<Tl

b

Ga<Al<In<Tl

c

Al<In<Ga<Tl

d

Al<Ga<Tl<In

answer is B.

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Detailed Solution

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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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