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Q.

Which of the following elements has the largest atomic radius?

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a

 61Nd

b

 62Sm

c

 63Eu

d

 64Gd

answer is C.

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Detailed Solution

Amongst lanthanides, Eu and Yb have abnormally high atomic radii. This may be attributed to (4f)7,(5d)0 and (4f)14(5d)0 electronic configurations, respectively.

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Which of the following elements has the largest atomic radius?