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.