1.

The increasing order of atomic radii of the following Group 13 elements is (A) Al < Ga < In < Tl (B) Ga < Al < In < Tl (C) Al < In < Ga < Tl (D) Al < Ga < T1 < In

Answer»

(B) Ga < Al < In < Tl 

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



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