Although Zirconium belongs to the 4d transiti | vedclass

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(C) Zirconium $(Zr)$ belongs to the $4d$ transition series and Hafnium $(Hf)$ belongs to the $5d$ transition series.They exhibit similar physical and

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both have similar atomic radii

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(C) Zirconium $(Zr)$ belongs to the $4d$ transition series and Hafnium $(Hf)$ belongs to the $5d$ transition series.They exhibit similar physical and chemical properties primarily because they possess similar atomic radii.This similarity in atomic radii is a direct consequence of the lanthanoid contraction,which occurs due to the poor shielding effect of $4f$ electrons in the $5d$ series elements.

Although Zirconium belongs to the $4d$ transition series and Hafnium to the $5d$ transition series,they show similar physical and chemical properties because . . . . . . .

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