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Question

(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:

Similar Questions

In which of the following pairs is the difference between the covalent radii of the two metals maximum?

Which of the following has the largest size?

Describe the theory associated with the radius of an atom as it:
$(a)$ gains an electron
$(b)$ loses an electron

The ionic sizes decrease in the order :-

The radius of isoelectronic species:

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