The increasing order of atomic radii of the following Group 13 elements is
← JEE Advanced 2016 · Paper 1
ChemistrySingle correct+3 / -1Question 21 of 54
JEE Advanced 2016 · Paper 1, Chemistry question 21
Answer and worked solution
Official answer: B
Ga follows the first transition series. Its 3d electrons shield poorly, so Ga (≈135 pm) is slightly smaller than Al (≈143 pm). Down the group, In and Tl are larger still.
Order: Ga < Al < In < Tl.
(B)