Because of lanthanoid contraction, whic...

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).

A

Zr (40) and Ta (73)

B

Ti (22) and Zr (40)

C

Zi (40) and Nb (41)

D

Zr (40) and Hf (72)

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The correct Answer is:

D

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