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

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

AIPMTAIPMT 2015The d-and f-Block Elements

Solution:

Due to lanthanide contraction ‘4d’ and ‘5d’ series of elements have almost same atomic radii.