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neptunium Definition

☆ nep·tu·nium (nep to̵̅o̅′nē əm, -tyo̵̅o̅′-)

noun

a silver-colored, radioactive, metallic chemical element, one of the actinides, produced by bombarding uranium atoms with neutrons: symbol, Np; at. no., 93

Etymology: ModL < Neptunus, Neptune + -ium: so named by Edwin Mattison McMillan & P. Abelson (1913-2004), U.S. physicists, because its at. no. is next after uranium's, as the planet Neptune is next beyond Uranus

neptunium Usage Examples

Modifies a noun

  • series: Now there are 11 cases in addition to those in the Neptunium series.

Browse dictionary entries near neptunium

  1. ‹ Neptune
  2. ‹ nepotism
  3. ‹ nephrotomy
  4. ‹ nephrosis
  5. ‹ nephron
  6. ‹ nephrology
  7. ‹ nephrogenic
  8. ‹ nephro-
  9. ‹ nephritis
  10. ‹ nephritic
  1. neptunium series ›
  2. NERC ›
  3. nerd ›
  4. Nereid ›
  5. nereis ›
  6. Nereus ›
  7. neritic ›
  8. Nernst ›
  9. Nero ›
  10. neroli ›