Explain why atomic radius of ga is less than that of al?

Question: Explain why atomic radius of ga is less than that of al?

The atomic radius of Ga is less than that of Al because Gallium has one more electron shell than Aluminum. Although both elements have the same number of valence electrons, Gallium has an extra electron shell which exerts a greater electrostatic force on the outermost electrons, pulling them closer to the nucleus and causing the atomic radius to decrease.

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