Q43 of 70 Page 111

Although +3 oxidation states is the characteristic oxidation state of lanthanoidsbut cerium shows +4 oxidation state also. Why?

Ce – [Xe] 4f1 5d1 6s2. Usually lanthanoids lose the 5d and 6s electrons and show +3 oxidation state, but Cerium loses the one 4f electron also so as to attain Xenon’s noble gas configuration which will make Ce4+ very stable.


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