Which of the following pairs has the same siz | vedclass

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Question

(C) In general,the atomic and ionic radii increase on moving down a group. However,the elements of the second transition series $(Zr, Nb, Mo, \dots)$

Vedclass · Accepted Answer

$Zr^{4+}, Hf^{4+}$

Vedclass · Answer

(C) In general,the atomic and ionic radii increase on moving down a group. However,the elements of the second transition series $(Zr, Nb, Mo, \dots)$ have almost the same radii as the elements of the third transition series $(Hf, Ta, W, \dots)$. This phenomenon is due to lanthanoid contraction,which arises from the imperfect shielding of one $4f$ electron by another,leading to a smaller increase in size than expected when moving from the $4d$ to the $5d$ series. Therefore,$Zr^{4+}$ and $Hf^{4+}$ have nearly identical ionic radii.

Which of the following pairs has the same size?

Similar Questions

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

Which of the following statements is incorrect?

In a transition series,with an increase in atomic number,the paramagnetism:

The $E^{\circ}$ value for the $Mn^{3+} / Mn^{2+}$ couple is more positive than that of $Cr^{3+} / Cr^{2+}$ or $Fe^{3+} / Fe^{2+}$ due to change of

The increasing order of magnetism of $(I)$ $MnSO_4 \cdot 4H_2O$,$(II)$ $FeSO_4 \cdot 7H_2O$,$(III)$ $NiSO_4 \cdot 6H_2O$,and $(IV)$ $CuSO_4 \cdot 5H_2O$ is:

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