Question

which one of two Al and Ga has larger atomic radius?

Answer 1

Al has larger atomic radius..
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Answer 2

Aluminum and Gallium belongs to group 13.
Generally as we move down to group, the atomic radii increases as the one higher level electronic orbital is required to accommodate the electrons.
Even though Gallium lies below Aluminum, the atomic size of Gallium is smaller than Aluminum because of
Shielding Effect..
In case of Gallium the outermost electrons are poorly shielded by d electrons increasing nuclear attraction of the outer electrons, which results the smaller radius of Gallium.