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Q.

Gallium has smaller atomic radius than aluminium because of 

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a

poor shielding power of d-electrons of Ga atom 

b

poor shielding power of s-electrons of Ga atom 

c

greater shielding power of s-electrons of Al atom

d

greater shielding power of d-electrons of Ga atom

answer is A.

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Detailed Solution

the atomic radius of Ga is slightly lower than that of Al, due to the electrons in Ga experience greater force of attraction by the nucleus than in Al and hence the atomic radius of Ga 135 pm is slightly less than that of Al 143 pm

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