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

(a) Ti (22) and Zr (40)

(b) Zr (40) and Nb (41)

(c) Zr (40) and Hf (72)

(d) Zr (40) and Ta (73)

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