U-235

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U-235 is a radioactive isotope of uranium that is used in nuclear reactors and certain nuclear weapons. The value 235 is the isotope's mass number, which indicates the total number of neutrons and protons in the nucleus of the atom. U-235 occurs naturally in such minerals as carnotite and pitchblende. It is always combined with two other uranium isotopes, U-234 and U-238.

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U-235

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