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The correct order of atomic radii in group 13 elements is (1) B < Al < In < Ga < Tl

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The correct order of atomic radii in group 13 elements is 

(1) B < Al < In < Ga < Tl 

(2) B < Al < Ga < In < Tl 

(3) B < Ga < Al < Tl < In 

(4) B < Ga < Al < In < Tl

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1 Answer

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(4) In group 13 due to transition contraction [Al > Ga]

Ga is slightly smaller than Al due poor shielding of d e– so Zeff. increasing. 

Atomic size : B < Ga < Al < In < Tl 

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