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, $Ga<Al<In<Tl$.
