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  4. Most common oxidation states of Ce (cerium) are:

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Q. Most common oxidation states of $Ce$ (cerium) are:

Classification of Elements and Periodicity in Properties

Solution:

Cerium $Ce _{58}=[ Xe ] 4 f ^{1}, 5 d ^{1}, 6 s ^{2}$
Its most stable oxidation state is $+3$ but $+4$ is also existing.