The correct order of atomic radii in group 13 elements is

The correct order of atomic radii in group 13 elements is
  1. B < Ga < Al < Tl < ln
  2. B < Al < Ga < ln < Tl
  3. B < Al < ln < Ga < Tl
  4. B < Ga < Al < ln < Tl

Solution

Ga is little smaller or have slightly lower atomic radius due to poor Screening effect by inner 3d electrons.
Elements B Ga Al In TI
Atomic radii (pm) 85 135 143 167 170

Asked in: JEE-TOPICTESTS-CHEMISTRY

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