Gallium is below aluminium in the periodic table but atomic radius of gallium is less than that of aluminium. It is due to

Lanthanide contraction

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Greater shielding effect

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Inert pair effect

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Poor shielding effect of d-electrons

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Solution

The correct option is D
Poor shielding effect of d-electrons

Poor shielding effect of d-electrons leads to a greater attraction of the outermost electrons, in turn leading to smaller size of gallium compared to aluminium.

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G a

A l

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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