The correct order of atomic radii of group 13 | vedclass

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Question

(C) The atomic radii of group $13$ elements are expected to increase down the group due to the addition of new shells. However, due to the poor shield

Vedclass · Accepted Answer

$Tl > In > Ga > Al$

Vedclass · Answer

(C) The atomic radii of group $13$ elements are expected to increase down the group due to the addition of new shells. However, due to the poor shielding effect of $d$ and $f$ orbitals (lanthanoid contraction), the atomic radius of $Tl$ is slightly larger than or nearly equal to $In$. The actual observed order is $Al Wait, checking the trend: $Al$ $(143 	ext{ pm})$, $Ga$ $(135 	ext{ pm})$, $In$ $(167 	ext{ pm})$, $Tl$ $(170 	ext{ pm})$. Thus, the correct order is $Al  In > Ga > Al$.

The correct order of atomic radii of group $13$ elements is

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