NEET 2018 Chemistry question

The correct order of atomic radii in group 13 elements is

(1)B < Ga < Al < Tl < In
(2)B < Al < Ga < In < Tl
(3)B < Al < In < Ga < Tl
(4)B < Ga < Al < In < TlCorrect

Answer: (4)

Solution

Atomic radii (pm): B 85, Ga 135, Al 143, In 167, Tl 170. Down a group the radius generally increases as new shells are added, so B is the smallest and In and Tl the largest. Ga is smaller than Al because of the poor shielding of the nuclear charge by the ten 3d

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Question ID VK-092243