The lanthanide contraction is responsible for the fact that
and have about the same radius
and have similar oxidation state
and have the same oxidation state
As we learnt in
Lanthanoid contraction -
The filling of if orbits before 5d orbits result regular decrease in atomic radii called Lanthanoid contraction or can say the size of radii not much increase.
Due to Lanthanoid contraction size of 5d-series elements is smaller than 4d-series element, that's why Zr and Hf have almost same atomic radii.
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