| Which of the following lanthanides ions is diamagnetic? [NEET 2013] |
| (At. nos. Ce = 58, Sm = 62, Eu = 63, Yb=70) |
A) \[C{{e}^{2+}}\]
B) \[S{{m}^{2+}}\]
C) \[E{{u}^{2+}}\]
D) \[Y{{b}^{2+}}\]
Correct Answer: D
Solution :
| Lanthanide ion with no unpaired electron is diamagnetic in nature. |
| \[C{{e}_{58}}=[Xe]4{{f}^{2}}5{{d}^{0}}6{{s}^{2}}\] |
| \[C{{e}^{2+}}=[Xe]4{{f}^{2}}\] |
| (two unpaired electrons) |
| \[S{{m}_{62}}=[Xe]4{{f}^{6}}5{{d}^{0}}6{{s}^{2}}\] |
| \[S{{m}^{2+}}=[Xe]4{{f}^{6}}\] |
| (six unpaired electrons) |
| \[E{{u}_{63}}=[Xe]4{{f}^{7}}5{{d}^{0}}6{{s}^{2}}\] |
| \[E{{u}_{63}}=[Xe]4{{f}^{7}}\] (seven unpaired electrons) |
| \[Y{{b}_{70}}=[Xe]4{{f}^{7}}5{{d}^{0}}6{{s}^{2}}\] |
| \[Y{{b}^{2+}}=[Xe]4{{f}^{14}}\] |
| (no unpaired electrons) |
| Because of the absence of unpaired electrons, \[Y{{b}^{2+}}\]is diamagnetic. |
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