Question

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 1

The correct option is C both have similar atomic radius

Zirconium belongs to 4d transition series and Hafnium belongs to 5d transition series but they show similarity in physical and chemical properties because of similar atomic radius arising because of lanthanoid contraction