Which actinoid elements can reach a +7 oxidation state?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — actinoid element Modern version of the periodic table of the elements (printable).

Within the actinoid series, only two elements are known to reach the +7 oxidation state: neptunium and plutonium.1

While many actinoids exhibit a range of oxidation states, the ability to reach the +7 state is unique to these two elements. Neptunium(VII) and plutonium(VII) have been successfully prepared in basic solutions, and researchers have also identified certain oxygenated ions and complex oxides with alkali metals in which these elements maintain this high oxidation state.1