Why is the atomic radius of Hf and Zr are nearly same?

1.	Why is the atomic radius of Hf and Zr are nearly same?
Answer» Answer: Zr and HF have almost IDENTICAL atomic radii due to LANTHANOID CONTRACTION. Hf is post lanthanoid element. As a result of lanthanoid contraction, the atomic size of Hf is similar to Zr ( element of PREVIOUS period)

Answer»

Answer:

Zr and HF have almost IDENTICAL atomic radii due to LANTHANOID CONTRACTION. Hf is post lanthanoid element. As a result of lanthanoid contraction, the atomic size of Hf is similar to Zr ( element of PREVIOUS period)

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Why is the atomic radius of Hf and Zr are nearly same?​

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Why is the atomic radius of Hf and Zr are nearly same?