Classification of Elements and Periodicity in Properties - Result Question 10

####10. The correct order of atomic radii in group 13 elements is

(a) B <Al< In <Ga<Tl

(b) B<Al<Ga< In < Tl

(c) B <Ga<Al< In <Tl

(d) B < Ga <Al<Tl< In

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Solution:

  1. (c) Due to poor shielding effect of 3d electrons in Ga, the atomic radii of Ga<Al. Thus, the correct order of atomic radii is B< Ga<Al<In<Tl.


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