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JEE Advanced · Chemistry · 3. Periodic Table

The increasing order of atomic radii of the following group 13 elements is

  1. A Al<Ga<In<Tl
  2. B Ga<Al<In<Tl
  3. C Al<In<Ga<Tl
  4. D Al<Ga<Tl<In
Verified Solution

Answer & Solution

Correct Answer

(B) Ga<Al<In<Tl

Step-by-step Solution

Detailed explanation

The order of radius of 13th group elements is Ga<Al<In<Tl.
ReasonDue to poor shielding effect of d-orbital, radius of Ga is smaller than Al.
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