Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:

20 2021 The d- and f-Block ElementsLanthanoids – Lanthanoid Contraction Easy
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:
A Diagonal relationship
B Lanthanoid contraction
C Having similar chemical properties
D Belonging to same group

Detailed Solution

Due to lanthanoid contraction (poor shielding by 4f electrons), Hf (5d series) has almost the same atomic and ionic radii as Zr (4d series).

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