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(B) The atomic radii of Group $13$ elements generally increase down the group due to the addition of new shells.
However, there is an anomaly between

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$Ga < Al < In < Tl$

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(B) The atomic radii of Group $13$ elements generally increase down the group due to the addition of new shells.
However, there is an anomaly between $Al$ and $Ga$.
$Al$ has an atomic radius of approximately $143 	ext{ pm}$, while $Ga$ has an atomic radius of approximately $135 	ext{ pm}$.
This occurs because $Ga$ follows the $3d$ transition series, where the $d$-electrons provide poor shielding for the outer electrons from the nuclear charge.
Consequently, the effective nuclear charge increases, causing the atomic radius of $Ga$ to be smaller than that of $Al$.
The correct increasing order is $Ga < Al < In < Tl$.

The increasing order of atomic radii of the following Group $13$ elements is:

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