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Write down the names of the lanthanoid e...

Write down the names of the lanthanoid elements which show + 4 and + 2 oxidation states. Correlate this type of behaviour with the electronic configuration of these elements.

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Sm, Eu, Tm, Yb show + 2 oxidation state and Ce, Pr, Tb and Dy show + 4 oxidation state. Nd shows both + 2 and + 4 oxidation state. Lanthanoid elements generally show + 3 oxidation states. But there are some elements which show either + 2 or + 4 or both the oxidation stats. This is due to mainly the stable electronic configuration of the corresponding ions.
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