Consider the Frost diagram of some actinoids (An) in aqueous solution shown below: Answer the following questions and fully explain your reasoning in each case. Why does Bk show only

2 oxidation states while Am, Pu, U show 4 different oxidation states? Why is the oxidation state +4 particularly stable for the element Th?[6] The oxocations AnO2* and AnO2²* (An = U, Pu, Am) have been isolated and studied. However, the oxocations LnO2+ and LnO2²+(Ln = Nd, Sm, Eu) areunknown. How can these observations be explained? Would you expect the following molecules to be observed? Explain your answer. CIF7 ArF4 Fully explain the origin of the difference in overall stability constants, measured in aqueous solution, for the two copper complexes in the table below.