Question:
The electronic configurations of bivalent europium and trivalent cerium are :
(atomic number: $Xe = 54, Ce =58, Eu ??63$)
The electronic configurations of bivalent europium and trivalent cerium are :
(atomic number: $Xe = 54, Ce =58, Eu ??63$)
Updated On: Sep 30, 2024
- $[Xe] 4f^7$ and $[Xe] 4f^1$
- $[Xe] 4f^7 \,6s^2$ and $[Xe] 4f^2\,6s^2$
- $[Xe] 4f^2$ and $[Xe] 4f^7$
- $[Xe] 4f^4$ and $[Xe] 4f^9$
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The Correct Option is A
Solution and Explanation
$Eu_{63} \Rightarrow\, \left[Xe\right] 4 f^{7} 5 d^{\circ} 6s^{2}$
$Eu^{2\oplus} \Rightarrow \left[Xe\right]4f^{7}$
$Ce_{58} \Rightarrow\left[Xe\right]4 f^{1} 5d^{1} 6s^{2}$
$Ce^{3\oplus} \Rightarrow\, \left[Xe\right]4f^{1}$
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