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

Al < Ga < In < Tl

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Ga < Al < In < Tl

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Al < In < Ga < Tl

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Al < Ga < Tl < In

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Solution

The correct option is B
Ga < Al < In < Tl

Atomic radius increases on moving down the group but due to poor shielding of d orbital, atomic radius of Ga is smaller than Al.

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