neptunium


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nep·tu·ni·um

 (nĕp-to͞o′nē-əm, -tyo͞o′-)
n. Symbol Np
A silvery, metallic, naturally radioactive element, atomic number 93, the first of the transuranium elements. Its longest-lived isotope is Np-237 with a half-life of 2.1 million years. Found in trace quantities in uranium ores, it is produced synthetically by nuclear reactions. See Periodic Table.

[After the planet Neptune (from the fact that it follows uranium in the periodic table).]

neptunium

(nɛpˈtjuːnɪəm)
n
(Elements & Compounds) a silvery metallic transuranic element synthesized in the production of plutonium and occurring in trace amounts in uranium ores. Symbol: Np; atomic no: 93; half-life of most stable isotope, 237Np: 2.14 × 106 years; valency: 3, 4, 5, or 6; relative density: 20.25; melting pt: 639±1°C; boiling pt: 3902°C (est)
[C20: from Neptune2, the planet beyond Uranus, because neptunium is the element beyond uranium in the periodic table]

nep•tu•ni•um

(nɛpˈtu ni əm, -ˈtyu-)

n.
a short-lived radioactive transuranic element produced in nuclear reactors by the neutron bombardment of U-238. Symbol: Np; at. no.: 93; at. wt.: 237.
[1940–45; Neptune + -ium2]

nep·tu·ni·um

(nĕp-to͞o′nē-əm)
Symbol Np A silvery, radioactive metallic element of the actinide series. It occurs naturally in minute amounts in uranium ores and is produced artificially as a by-product of plutonium production. The most stable isotope of neptunium has a half-life of 2.1 million years. Atomic number 93. See Periodic Table.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.neptunium - a radioactive transuranic metallic elementneptunium - a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
Translations
нептуний
neptunium
neptunium
neptunio
neptuunium
neptunium
neptunium
neptunij
neptúnium
nettunio
ネプツニウム
neptunium
neptunium
neptun
neptuniu
neptunium
neptunij
neptunium
neptünyum

neptunium

[nepˈtjuːnɪəm] Nneptunio m

neptunium

n (Chem) → Neptunium nt
References in periodicals archive ?
This contract is for the renovation of the pool Neptunium in Schaerbeek.
MST exhibits excellent performance to remove dissolved strontium, plutonium, neptunium and uranium from highly alkaline salt solutions such as the high-level nuclear waste solutions stored at the Savannah River Site from fuel reprocessing operations.
Washington, Mar 18 (ANI): Neptunium, a waste product from uranium reactors, could pose a serious health risk should it ever seep its way into groundwater - even five million years after it is deposited at a dump.
plutonium, americium, curium or neptunium from the spent fuel or HLW.
analyzing neptunium exposure through urine samples would be too
West Lake's thorium-230 and actinium-227 have been ranked along with plutonium, americium and neptunium as among the most radioactively dangerous materials known.
Topics include the mechanisms of long-term uranium transport under oxidizing conditions, the structural chemistry of thorium iodates, the structural investigation of neptunium (IV) in toxicological processes, murataite ceramics doped with lanthanides and uranium, and the effects of hydrogen peroxide on the stability of becquerelite.
Another option is that of partitioning and the transmutation of the long-lived actinides, americium, curium and neptunium.