p-Block Elements-I - Result Question 36
7. The increasing order of atomic radii of the following Group $13$ elements is
(2016 Adv.)
(a) $Al < Ga < In < Tl$
(b) $Ga < Al < In < Tl$
(c) $Al < In < Ga < Tl$
(d) $Al < Ga < Tl < In$
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Answer:
Correct Answer: 7. (b)
Solution:
- Due to poor shielding of $d$-orbital in $Ga$, atomic radius of $Ga$ is smaller than that of $Al$. Thus, $Ga < Al < In < Tl$.
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