Zr(40) and Hf(72) have similar atomic and ionic radii because of Lanthanoid Contraction. The 4f orbital offers very poor screening. So, the radius (atomic as well as Ionic) of Zr and Hf are almost the same.
Zr(Z=40) and Hf(Z=72) have similar atomic and ionic radii because of:
Held on 30 Apr 2021 · Verified 9 Jul 2026.
belonging to same group
diagonal relationship
lanthanoid contraction
having similar chemical properties
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