Which of the following elements has the largest atomic radius?

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$_{61} Nd$

$_{62} Sm$

$_{63} Eu$

$_{64} Gd$

answer is C.

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Detailed Solution

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

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