Which of the following lanthanoid ion is paramagnetic ?A. `Ce^(4+)`B. – InterviewSolution

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1.	Which of the following lanthanoid ion is paramagnetic ?A. `Ce^(4+)`B. `Yb^(2+)`C. `Lu^(3+)`D. `Eu^(2+)`
Answer» `Ce= [Xe] 4f^(1) 5d^(1) 6s^(2), Ce^(4+)= [Xe]` `Yb= [Xe] 4f^(14) 6s^(2) , Yb^(2+) = [Xe] 4f^(14)` `Lu = [Xe] 4f^(14) 5d^(1) 6s^(2) ,Ly^(3+) = [Xe] 4f^(14)` `E u= [Xe]4f^(7)6s^(2) , Eu^(2+) = [Xe] 4f^(7)` Thus, only `Eu^(2+)` has unpaired electrons , vix.7.

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