The electronic configurations of bivalent europium and trivalent cerium are
Question:

The electronic configurations of bivalent europium and trivalent cerium are

(atomic number: $\mathrm{Xe}=54, \mathrm{Ce}=58, \mathrm{Eu}=63$ )

  1. $[\mathrm{Xe}] 4 \mathrm{f}^{4}$ and $[\mathrm{Xe}] 4 \mathrm{f}^{9}$

  2. [Xe] $4 \mathrm{f}^{7}$ and [Xe] $4 \mathrm{f}^{1}$

  3. $[\mathrm{Xe}] 4 \mathrm{f}^{7} 6 \mathrm{~s}^{2}$ and $[\mathrm{Xe}] 4 \mathrm{f}^{2} 6 \mathrm{~s}^{2}$

  4. $[\mathrm{Xe}] 4 \mathrm{f}^{2}$ and [Xe] $4 \mathrm{f}^{7}$


Correct Option: , 2

Solution:

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