Why does cerium exhibit + 4 oxidation state ?

Sulphur does not exhibit +6 oxidation state in

Give reasons: Cerium (Ce) exhibits +4 oxidation state.

Give reasons : Cerium (Ce) exhibits +4 oxidation state

Which of the group - 16 elements does not exhibits negative oxidation state ? Why ?

Give reason : a) Cerium (Ce) exhibits +4 oxidation state. b) Actinoid contraction is greater from element to element than lanthanoid contraction.

Explain. Why fluorine exhibits an oxidation state of -1 only, while other elements of the family exhibit oxidation state of -1 +1, +3, +5 and +7.

Assertion (A): Cerium (Ce) exhibits +4 oxidation state. Reason (R): Ce^(4+) has 4f^4 electronic configuration which is less stable.