Look up: neptunium

1. neptunium
   [n] - a radioactive transuranic metallic element
   Found on http://www.webdictionary.co.uk/definitio
   
   
2. Neptunium
   Produced artificially by nuclear reaction between uranium and neutrons. Symbol Np
   Found on http://www.diracdelta.co.uk/science/sour
   
   
3. neptunium
   chemical element: atomic number 93 Category: Chemistry
   Found on http://www.mijnwoordenboek.nl/definition
   
   
4. Neptunium
   Nep·tu'ni·um noun [ New Latin ] A new metallic element, of doubtful genuineness and uncertain identification, said to exist in certain minerals, as columbite. Hermann.
   Found on http://www.encyclo.co.uk/webster/N/15
   
   
5. neptunium
   <chemical> Neptunium. A radioactive element of the actinide metals family. It has the atomic symbol np, atomic number 93, and atomic weight 237. ... Chemical name: Neptunium ... (12 Dec 1998) ...
   Found on http://www.mondofacto.com/facts/dictiona
   
   
6. neptunium
   Np noun a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
   Found on http://wordnetweb.princeton.edu/perl/web
   
   
7. neptunium
   (Np) (nep-too´ne-әm) a chemical element, atomic number 93, atomic weight 237.
   Found on http://www.encyclo.co.uk/local/21001
   
   
8. Neptunium
   • (n.) A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite. • (n.) A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.
   Found on http://thinkexist.com/dictionary/meaning
   
   
9. neptunium
   radioactive chemical element of the actinoid series of the periodic table, first transuranium element to be artificially produced, atomic number 93. ... [6 related articles]
   Found on http://www.britannica.com/eb/a-z/n/26
   
   
10. neptunium
    neptunium (neptOO'nēum) , radioactive chemical element; symbol Np; at. no. 93; at. wt. 237.0482; m.p. about 640°C; b.p. 3,902°C (estimated); sp. gr. 20.25 at 20°C; valence +3, +4, +5, or +6. Neptunium is a ductile, silvery radioactive metal. It is a member of the actinide serie...
    Found on http://www.infoplease.com/ce6/sci/A08352
    
    
11. Neptunium
    Neptunium is a silvery metallic transuranic element synthesized in the production of plutonium and occurring in trace amounts in uranium ores. It was the first element to be made synthetically, being artificially produced in 1940 by the bomardment of uranium with neutrons by Edwin McMillan and Philip Abelson.
    Found on http://www.probertencyclopaedia.com/brow
    
    
12. neptunium
    (Np) Type: Term Pronunciation: nep-tū′nē-ŭm Definitions: 1. A radioactive element; atomic no. 93; first element of the transuranian series (not found in nature); 237Np has a half-life of 2.14 ׀ 106 years.
    Found on http://www.medilexicon.com/medicaldictio
    
    
13. neptunium
    Silvery, radioactive metallic element of the actinide series, atomic number 93, relative atomic mass 237.048. It occurs in nature in minute amounts in pitchblende and other uranium ores, where it is produced from the decay of neutron-bombarded uranium in these ores. The longest-lived isotope, Np-237, has a half-life of 2.2 million y...
    Found on http://www.talktalk.co.uk/reference/ency