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  4. Which of the following lanthanide ion is paramagnetic?

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Q. Which of the following lanthanide ion is paramagnetic?

J & K CETJ & K CET 2010The d-and f-Block Elements

Solution:

$Ce \rightarrow[ Xe ] 4 f^{1} 5 d^{1} 6 s ^{2} ; Ce ^{4+} \rightarrow[ Xe ]$
$Y b \rightarrow[ Xe ] 4 f^{14} 6 s ^{2} ; Y b^{2+} \rightarrow[ Xe ] 4 f^{14}$
$Lu \rightarrow[ Xe ] 4 f^{14} 5 d^{1} 6 s ^{2} ; Lu ^{3+} \rightarrow[ Xe ] 4 f^{14}$
$Eu \rightarrow[ Xe ] 4 f^{7} 6 s^{2} ; Eu ^{2+} \rightarrow[ Xe ] 4 f^{7}$