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

Question

Assertion: Atomic radius of Ga is larger than that of aluminium. Reason: Atomic radius always increases down the group. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

There are deviations in properties of elements of a group in p-block. Atomic radius of Ga is less than that of Al because of the presence of additional 10 d-electrons which offer poor screening effect for the outer electrons from the increased nuclear charge in gallium.

Q. Assertion : Atomic radius of $G a$ is larger than that of aluminium.
Reason : Atomic radius always increases down the group.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

There are deviations in properties of elements of a group in $p$ -block. Atomic radius of $G a$ is less than that of $A l$ because of the presence of additional $10 d$ -electrons which offer poor screening effect for the outer electrons from the increased nuclear charge in gallium.

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