1. Tardigrade
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  3. Chemistry
  4. Assertion: Atomic radius of Ga is larger than that of aluminium. Reason: Atomic radius always increases down the group.

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

The p-Block Elements

Solution:

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.