neptunium

neptunium
neptunium [nep to͞o′nē əm, neptyo͞o′nē əm ]
n.
[ModL < Neptunus, NEPTUNE + -IUM: so named by MCMILLAN Edwin MattisonEdwin MattisonEdwin MattisonEdwin MattisonEdwin MattisonEdwin Mattison & P. Abelson (1913-2004), U.S. phys i cists, because its at. no. is next after uranium's, as the planet Nep tune is next beyond Uranus]
a silver-colored, radioactive, metallic chemical element, one of the actinides, produced by bombarding uranium atoms with neutrons: symbol, Np; at. no., 93: see the periodic table of elements in the Reference Supplement

English World dictionary. . 2014.

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Look at other dictionaries:

  • Neptunium — Uranium ← Neptunium → Plutonium Pm …   Wikipédia en Français

  • NEPTUNIUM — Élément chimique de numéro atomique 93, le neptunium (symbole Np) est le premier membre de la série d’éléments lourds artificiels: les transuraniens. Comme tous ces éléments, il a de nombreux isotopes qui sont tous radio actifs et produits… …   Encyclopédie Universelle

  • 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] …   The Collaborative International Dictionary of English

  • NEPTUNIUM — alias Navale Antiatum, oppid. ditionis Pontificiae cum portu tantisper capaci, in Latio, in ora maris Tyrrheni alias sub dominio utili Columnarum, medium inter Terracinam ad Ortum et ostia Tiberina ad Occasum, 25. milliar. utrinque, versus… …   Hofmann J. Lexicon universale

  • neptunium — Symbol: Np Atomic number: 93 Atomic weight: (237) Radioactive metallic transuranic element, belongs to the actinoids. Np 237, the most stable isotope, has a half life of 2.2*10^6 years and is a by product of nuclear reactors. The other known… …   Elements of periodic system

  • neptunium — (n.) 1941, from NEPTUNE (Cf. Neptune) + element ending ium. Named for its relative position in the periodic table, next after URANIUM (Cf. Uranium), as the planet Neptune is one beyond Uranus. Cf. also PLUTONIUM (Cf. plutonium) …   Etymology dictionary

  • Neptunium — uranium ← neptunium → plutonium Pm ↑ Np ↓ (Uqt) …   Wikipedia

  • Neptunium — Eigenschaften …   Deutsch Wikipedia

  • neptunium — /nep tooh nee euhm, tyooh /, n. Chem., Physics. a transuranic element produced in nuclear reactors by the neutron bombardment of U 238: decays rapidly to plutonium and then to U 235. Symbol: Np; at. no.: 93. [1940 45; NEPTUNE + IUM] * * * ▪… …   Universalium

  • Neptunium — Nep|tu|ni|um 〈n.; s; unz.; chem. 〉 künstliches radioaktives Element, Ordnungszahl 93 [neulat., nach dem Planeten Neptun] * * * Nep|tu|ni|um [nach dem Planeten Neptun, der nach dem Uranus (↑ Uran) entdeckt wurde; ↑ ium (1)], das; s; Symbol: Np: in …   Universal-Lexikon

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