Answer:
Both \[Zr\] and \[Hf\] are present
in group 4 (d-block). The atomic radius of Zr (160 pm) is quite close to that
of Hf (159 pm). Actually, Hf experiences lanthanoid contraction which causes a
decrease in its atomic size and atomic radius. Therefore, the two elements have
identical sizes. For more details, consult section 8.11.
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