Perxenate
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The perxenates are salts of perxenic acid, H4XeO6. The acid and the anion XeO64− are both strong oxidizing agents, and the acid can be formed by dissolving xenon tetroxide, XeO4, into water, like most preparations. The sodium and potassium salts are soluble, but the barium salt may form a marvellous display of xenon trapped in an insoluble crystal.