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Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

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Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

(1) belonging to same group

(2) diagonal relationship

(3) lanthanoid contraction

(4) having similar chemical properties

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Correct answer: (3) lanthanoid contraction

Explanation:

Due to lanthanoid contraction Zr and Hf has similar atomic and ionic radii.

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