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 isotopes have mass numbers 229 through 236, and 238 through 241. Np-236 has a half-life of 5*10^3 years. First produced by Edwin M. McMillan and P.H. Abelson in 1940.

Elements of periodic system. 2013.

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  • 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

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  • 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 — ☆ 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… …   English World 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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