Assertion : Atomic radius of Ga is larger than that of aluminium Reason : Atomic radius always increases down the groups.

Assertion : Atomic radius of Ga is larger than that of aluminium Reas

1.	Assertion : Atomic radius of Ga is larger than that of aluminium Reason : Atomic radius always increases down the groups.
Answer» Solution :There are DEVIATIONS in properties of elements of a group in p-block Atomic radius of Ga is LESS than that al Al because of the PRESENCE of additional 10 d-electrons which offer POOR screeningeffect for the outer electrons from the increased nuclear charge in gallium.