First slide

13th group or boron group

Question

The increasing order of atomic radii of the following group 13 elements is__?

Moderate

A

$A l < G a < I n < T l$
B

$Ga<Al<In<Tl$
C

$A l < I n < G a < T l$
D

$A l < G a < T l < I n$

Solution

The atomic radii of this family follow a irregular order due to d orbital contraction and f orbital contraction. The size of Ga is decreased due to poor shielding by the d orbital electrons and the value turns out to be less than Al.

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