The decay chain of Uranium-238 ends with Lead-206, and the decay chain of Uranium-235 ends with Lead-207. Thorium and Radium are intermediate products in the decay series, not the final stable element.
The ultimate product of radioactive disintegration of uranium is
Asked in CGPSC Prelims Exam 2013 · Topic: Nuclear Physics (Radioactivity: Alpha, Beta (Fermi theory, selection rules, parity violation), Gamma decay (multipole transitions, internal conversion).)
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