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neptunium    音标拼音: [nɛpt'uniəm]
n. 镎

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neptunium
n 1: a radioactive transuranic metallic element; found in trace
amounts in uranium ores; a by-product of the production of
plutonium [synonym: {neptunium}, {Np}, {atomic number 93}]

Neptunium \Nep*tu"ni*um\, n. [NL.]
A radioactive metallic element of atomic number 93, produced
in nuclear reactors from Plutonium or Uranium. Symbol Np; The
atomic weight of the most stable isotope is 237.0482.
[PJC]

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