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21/09/2021 11:01 am
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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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21/09/2021 11:05 am
Correct answer: (3) lanthanoid contraction
Explanation:
Due to lanthanoid contraction Zr and Hf has similar atomic and ionic radii.