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JEE Advanced2016ChemistryClassification of Elements and Periodicity in PropertiesActual

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

Options

  1. AAl < Ga < In < Tl
  2. BGa < Al < In < Tl
  3. CAl < In < Ga < Tl
  4. DAl < Ga < Tl < In

Correct answer

B. Ga < Al < In < Tl

Step-by-step solution

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

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