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neptunium

noun
/nepˈtjuːniəm/
/nepˈtuːniəm/
[uncountable]
(symbol Np)
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  1. a chemical element. Neptunium is a radioactive metal.镎(放射性化学元素)
    Word Originlate 19th cent.: from Neptune, on the pattern of uranium (Neptune being the next planet beyond Uranus).
neptunium
Chemical elements:actinium, alkali metal, americium...

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