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(B) The atomic radii of elements in the same group generally increase down the group due to the addition of new shells. However, for elements in the $

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$II$ & $III$

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(B) The atomic radii of elements in the same group generally increase down the group due to the addition of new shells. However, for elements in the $4d$ and $5d$ series, the atomic radii are often very similar due to the lanthanoid contraction.$1$. $Zr$ ($4d$ series) and $Hf$ ($5d$ series) have nearly identical atomic radii ($160 	ext{ pm}$ and $159 	ext{ pm}$ respectively) because of the lanthanoid contraction.$2$. $Mo$ ($4d$ series) and $W$ ($5d$ series) also exhibit nearly identical atomic radii ($140 	ext{ pm}$ and $141 	ext{ pm}$ respectively) due to the same phenomenon.Therefore, pairs $II$ and $III$ have nearly the same atomic radius.

Consider the following pairs of elements and identify the pairs of elements which have nearly same atomic radius.
$I$. $Y, La$
$II$. $Zr, Hf$
$III$. $Mo, W$
$IV$. $Cr, Mo$

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Consider the following pairs of elements and identify the pairs of elements which have nearly same atomic radius.$I$. $Y, La$$II$. $Zr, Hf$$III$. $Mo, W$$IV$. $Cr, Mo$