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:

  1. 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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