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    • Button of plutonium metal.
    Rights: United States Department of Energy, Public domain Published 17 September 2009 Size: 28 KB Referencing Hub media

    Plutonium is a silvery metal that tarnishes in air to form a yellow oxide. It is a radioactive poison, and care needs to be taken during handling.

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      ARTICLE

      The search for new elements

      Of all the elements currently known about 90 are naturally occurring. How are the others made? Particle accelerators allow atoms to be smashed together at high energies and new elements can be ...

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