Question

Which of the following group’s elements have smaller atomic radii?

(a) Group 1 elements

(b) Group 2 elements

(c) Group 13 elements

(d) All have the same atomic radii

I got this question in semester exam.

Asked question is from p-Block Elements topic in portion p-Block Elements of Chemistry – Class 11

Answer 1

Right answer is (c) Group 13 elements

Easiest explanation: Group 13 elements have smaller atomic radii and ionic radii than those of alkaline earth metals and alkali metals due to the greater effective nuclear charge, atomic radii increases on going down the group with an abnormality at gallium.