Q. The correct order of atomic radii in group 13 elements is
A) B < Ga < Al < Tl < In
B) B < Al < Ga < In < Tl
C) B < Al < In < Ga < Tl
D) B < Ga < Al < In < Tl
Explanation
[Solution] Poor shielding by 3d electrons makes Ga smaller than Al: B < Ga < Al < In < Tl. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.