Q. 204.0( 1 Vote )

Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because___________.
A. both belong to d-block.

B. both have same number of electrons.

C. both have similar atomic radius.

D. both belong to the same group of the periodic table.

Answer :

Due to lanthanide contraction, the f electrons shield very poorly which leads to an increase in effective nuclear charge and hence a contraction in size. So, the atomic radii of Zirconium and Hafnium are very similar and therefore they have similar physical and chemical properties.

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