The correct order of atomic radii in group 13 elements is

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

Solution

In group $13$, due to inert electron pair effect of $Ga$, the size order will be $Al > Ga$.

Asked in: NEET 2018

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