Looking for classes? Ksquare Career Institute, Bengaluru →
The correct order of atomic radii in group 13 elements is
Explanation
Poor shielding by d-electrons makes Ga smaller than Al.
Detailed Solution
Atomic radii (pm): B = 85, Ga = 135, Al = 143, In = 167, Tl = 170
So the order is B < Ga < Al < In < Tl (Ga is smaller than Al due to poor shielding by 3d electrons).