09-27-2021-1747 - radioactive elements such as plutonium is complicated by the fact that solutions of this element can undergo disproportionation[11] and as a result many different oxidation states can coexist at once.

radioactive elements such as plutonium is complicated by the fact that solutions of this element can undergo disproportionation^[11] and as a result many different oxidation states can coexist at once. 

https://en.wikipedia.org/wiki/Radiochemistry