Generally atomic radii increases down the group, but atomic radius of Ga is less than that of Al. Why?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

The presence of additional 10 d-electrons offer only poor screening effect for the outer electrons from the increased nuclear charge in gallium hence the atomic radius of Ga is less than Al.

Answered by  | 4th Jun, 2014, 03:23: PM