The highest possible oxidation states of uranium and plutonium, respectively are ______.

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The highest possible oxidation states of uranium and plutonium, respectively are 6 and 7. Explanation: Uranium (U) shows oxidation states from +3 to +6, but the +6 state is the highest and most stable, especially in compounds like \ce{UO^{2+}_2} (uranyl ion). Plutonium (Pu) can exhibit oxidation states from +3 to +7, with +7 being the highest in some strongly oxidising environments.

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