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NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice

The correct order of atomic radii in group 13 elements is

Options

  1. AB < Ga < Al < Tl < ln
  2. BB < Al < Ga < ln < Tl
  3. CB < Al < ln < Ga < Tl
  4. DB < Ga < Al < ln < Tl

Correct answer

D. B < Ga < Al < ln < Tl

Step-by-step solution

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

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