Which of the following lanthanoids show +2 oxidation state besides the characteristic oxidation state +3 of lanthanoids?
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- Eu
- Yb
- Cerium (Z = 57) ⇒ Electronic configuration $=[\text{Xe}]4\text{f}^55\text{d}^06\text{s}^2$
- Europium (Z = 63) ⇒ Electronic configuration $=[\text{Xe}]4\text{f}^75\text{d}^06\text{s}^2$
- Ytterbium (Z = 70) ⇒ Electronic configuration $=[\text{Xe}]4\text{f}^{14}5\text{d}^06\text{s}^2$
- Holmium (Z = 67) ⇒ Electronic configuration $=[\text{Xe}]4\text{f}^{11}5\text{d}^06\text{s}^2$
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