Plutonium

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  • A heavy, radioactive, manmade metallic element with atomic number 94. Its most important isotope is fissile plutonium-239, which is produced by neutron irradiation of uranium-238. It exists in only trace amounts in nature.
    Source: U.S. Nuclear Regulatory Commission
  • A radioactive metallic element chemically similar to uranium.
    Source: Terms of the Environment


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