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| Q. |
Uranium eventually decays into a stable isotope of — |
| A. | Radium |
| B. | Thorium |
| C. | Lead |
| D. | Polonium |
| Answer» C. Lead | |
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Explanation: Natural uranium consists of three major isotopes: U238 (99.28% natural abundance), U235 (0.71%), and U234 (0.0054%). All three are radioactive, emitting alpha particles, with the exception that all three of these isotopes have small probabilities of undergoing spontaneous fission, rather than alpha emission. U23° is usually an alpha emitter (occasionally, it undergoes spontaneous fission), decaying through the "Uranium Series" ofnuclear decay, which has 18 members, all of which eventually decay into Pb206, by a variety of different decay paths. |
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