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Atomic radius of Ga is smaller than that of Al because of

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Strong shielding effect of 3d electrons in Ga

Poor shielding effect of 3s electrons in Al

poor shielding effect of 4s electrons in Ga

poor shielding effect of 3d electrons in Ga

answer is D.

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Detailed Solution

Electronic configuration of Al = [Ne]3s²3p¹

Electronic configuration of Ga = [Ar]3d¹⁰4s²4p¹

poor shielding effect of 10 3d electrons in Ga,atomic size is much smaller than expected.

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