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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