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Question:

The increasing order of atomic radii of the following Group 13 elements is:

Ga<Al<In<Tl

Al<Ga<In<Tl

Al<In<Ga<Tl

Al<Ga<Tl<In

Solution:

The increasing order of atomic radii of group 13 elements is :Ga(135pm)<Al(143pm)<In(167pm)<Tl(170pm)