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uranium(U)  (u-raŽne-әm)   a hard and heavy radioactive metallic element; atomic number, 92; atomic weight, 238.03; see Appencix 6. Naturally occurring uranium is composed of three isotopes of mass numbers 234, 235, and 238. Uranium 235 separated from U 238 undergoes fission with slow neutrons, giving up neutrons which can join the nucleus of U 238 to form neptunium, which in turn decays by beta particle emission to form plutonium.




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