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| nep·tu·ni·um [ nep tnee əm ] |
noun |
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| Definition: |
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chemical element: a silvery radioactive metallic element. Source: uranium ores, a byproduct of plutonium production in nuclear reactors. Use: neutron detection.
Symbol Np
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| [Late 19th century. After the planet Neptune, discovered after uranium (named for Uranus)] |
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