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Zr(Z=40) and Hf(Z=72) have similar atomic and ionic radii because of :
 (1) having similar chemical properties
 (2) belogning to same group
 (3) diagonal relationship
 (4) lanthanoid contraction

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(4) lanthanoid contraction

::From IV A to II B Due to lanthanoid contration size of 4d & 5d series elements of same group are approx same.

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