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Q.

Which of the following is correct with respect to the atomic size in 13th group?

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a

B < Ga < Al < In < Tl

b

B < Al < Ga < In < Tl

c

B < Al < In < Ga < Tl

d

Ga < B < Al < In < Tl

answer is A.

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Detailed Solution

rGa (135 pm) < rAl (143 pm). It is because of the effect of 3d10 electrons in Ga which have poor shielding on force of nucleus on electrons of the valence shell.
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