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| plu·to·ni·um [ ploo tṓnee əm ] |
noun |
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| Definition: |
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silvery radioactive metallic element: a highly toxic silvery radioactive metallic element. Source: uranium ore. Use: as plutonium-239, production of atomic energy and weapons.
Symbol Pu
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| [Mid-20th century. After the planet Pluto, because it follows uranium and neptunium in the periodic table] |
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