Although `+3` is the characteristic oxidation state for lanthanoids but cerium also shows `+4` oxidation state because

Although + 3 is the characteristic oxidation state for lanthanoids but cerium also shows + 4 oxidation states, because -

Although +3 is the characteristic oxidation state for lanthanoids, cerium shows-14.oxidationstate also because

What is the most characteristic oxidation state of lanthanoids?

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

Although +3 oxidation stae is thje characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why ?