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

Greater shielding effect of s-electrons of Ga atoms

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Poor shielding effect of s-electrons of Ga atoms

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Poor shielding effect of d-electrons of Ga atoms

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Greater shielding effect of d-electrons of Ga atoms

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Solution

The correct option is C
Poor shielding effect of d-electrons of Ga atoms

Due to poor shielding effect of d-electrons, nuclear attraction over valency electrons increases hence atomic size decreases

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The valence "s” electrons act as inner core electrons due to poor shielding of "d” and "f”. This is known as the inert pair effect.

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