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Which of the following lanthanoid ions is diamagnetic? (Atomic number of `Ce=58,Sm=62,Eu=63,Yb=70`]A. `Sm^(2+)`B. `Eu^(2+)`C. `Yb^(2+)`D. `Ce^(2+)` |
Answer» Correct Answer - C Diamagnetic specied contains no unpaired electrons: `Ce: [Xe] 4f^(1)5d^(1) 6s^(2)rArr Ce^(2+: [Xe]4f^(1)5d^(1)`, two unpaired eletrons `Sm: [Xe] 4f^(6) 6s^(2) rArr Sm^(2+):[Xe] 4f^(6)`[ six unpaired electrons `Eu: [Xe] 4f^(7) 6s^(2) rArr Eu^(2+): [Xe] 4f^(7)`, seven unpaired electrons `Yb:[Xe] 4f^(14) 6s^(2) rArr Yb^(2+):[Xe]4f^(14)`, zero unpiared electrons Thus, `Yb^(2+)` ion is diamagnetic. |
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