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Q.

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

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a

Strong shielding effect of 3d electrons in Ga

b

poor shielding effect of 4s electrons in Ga 

c

Poor shielding effect of 3s electrons in Al

d

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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