Assertion: cerium's oxidation state | /r/HasProperty | common
Facets:
Source sentences:
text: Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3, but the oxidation state +2 is also common.
text: Cerium has two common oxidation states, +3 and +4.
text: Cerium has two common oxidation states, +3 and +4.