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Al and Ga have nearly the same covalent radii, because of

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Poor shielding effect of ‘d’ electrons of ‘Ga’ atoms

Greater shielding effect of ‘s’ electrons of ‘Ga’ atoms

Greater shielding effect of ‘d’ electrons of 'Ga' atoms

Poor shielding effect of ‘s’ electrons of ‘Ga’ atoms

answer is C.

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Detailed Solution

Poor shielding increases the effective nuclear charge, thereby decreasing atomic radius. This effect counterbalances the effect of increase in atomic radius due to addition of another shell.

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