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RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
Animation of a uranium atom. A uranium atom consists of a nucleus of 92 protons (red) orbited by 92 electrons (yellow). It has numerous isotopes with different numbers of neutrons (grey). Most naturally-occurring uranium has 146 neutrons (uranium-238). Uranium-235, with 143 neutrons, is fissile and used in nuclear reactors and weapons.
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