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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