Which of the following pairs has the same siz | vedclass

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

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

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(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?

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