1. The most common oxidation state of actinoids is +3.
2. In addition to that actinoids show variable oxidation states such as +2, +3, +4, +5, +6 and +7.
3. The elements Americium (Am) and Thorium (Th) show +2 oxidation state in some compounds.
4. Th, Pa, U, Np, Pu and Am show +5 oxidation states.
5. Np and Pu exhibit +7 oxidation state.