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