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The atomic radius of gallium is greater than that of aluminum.

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in Chemistry – Class 11 by (148k points)
The atomic radius of gallium is greater than that of aluminum.

(a) True

(b) False

I got this question in an online quiz.

This interesting question is from p-Block Elements in chapter p-Block Elements of Chemistry – Class 11

1 Answer

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Right answer is (b) False

Easiest explanation: Though the atomic radii increase on going down the group, the radius of gallium decreases unexpectedly because of the presence of electrons in the orbitals which do not screen the attraction of the nucleus effectively. So the atomic radius of gallium is less than that of aluminium.

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