Answer:thorium-234Explanation:Uranium's most stable isotope, uranium-238, has a half-life of about 4,468,000,000 years. It decays intothorium-234through alpha decay or decays through spontaneous fission.Uranium-238decays by alpha emission intothorium-234, which itself decays by beta emission toprotactinium-234, which decays by beta emission touranium-234, and so on. The various decay products, (sometimes referred to as“progeny” or“daughters”) form a series starting at uranium-238. After several more alpha and beta decays, the series ends with the stable isotopelead-206....

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