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Definition of Neptonium

Nep*tu"ni*um (?), n. [NL.] A new metallic element, of doubtful genuineness and uncertain identification, said to exist in certain minerals, as columbite. Hermann.

- Webster's Unabridged Dictionary (1913)

  • The transuranic chemical element with atomic number 93 and symbol Np.


Neptunium


    German
  • neptunium
- The Nuttall Encyclopedia

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