Which among the following lanthanoids forms most stable +2 oxidation state?

Which among the following lanthanoids forms most stable +2 oxidation state?
  1. $\mathrm{Eu}(\mathrm{Z}=63)$
  2. $\mathrm{Ce}(\mathrm{Z}=58)$
  3. $\operatorname{Pm}(\mathrm{Z}=61)$
  4. $\mathrm{Gd}(\mathrm{Z}=64)$

Solution

$\operatorname{Eu}(63)=[\mathrm{Xe}] 4 \mathrm{f}^7 6 \mathrm{~s}^2$

Asked in: MHT CET 2022 (06 Aug Shift 2)

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