Chemistry - PERIODIC TABLE Question with Solution | TestHub

Given below are the pairs of group 13 element showing their relation in terms of atomic radius.
$(\mathrm{B}<\mathrm{Al}),(\mathrm{Al}<\mathrm{Ga}),(\mathrm{Ga}<\mathrm{In})\text{ and }(\mathrm{In}<\mathrm{Tl})$
Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius $\left({\mathrm{M}}^{3+}\right)$ that the other one. The atomic number of the element $(\mathrm{X})$ is