1. 
   Dubnium
   Discovered : at both Berkeley, California, USA, and Dubna, near Moscow, Russia in 1970Description:A highly radioactive metal which does not occur naturally, and of which only a few atoms have ever been made. It is of research interest only.Origin:The element is named after the Russian town of Dubna....
   Found op http://www.allchemicals.info/index/action/detail/keyword/D/id/1059587670.ph
   
   
2. 
   dubnium
   Db noun a transuranic element
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=dubnium
   
   
3. 
   dubnium
   an artificially produced radioactive transuranium element in Group Vb of the periodic table, atomic number 105. The discovery of dubnium (element ... [1 related articles]
   Found op http://www.britannica.com/eb/a-z/d/79
   
   
4. 
   dubnium
   Type: Term Pronunciation: dūb′nē-ŭm Definitions: 1. An artificial transplutonium element; atomic number 105; atomic weight 262 [Formerly called Unnilpentium, Unp; and Joliotium, after the French physicist F. Joliot-Curie.]
   Found op http://www.medilexicon.com/medicaldictionary.php?t=26783
   
   
5. 
   Dubnium
   Dubnium (m {respell|DOOB|nee-əm}), is a chemical element with the symbol Db and atomic number 105, named after the town of Dubna in Russia, where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most s...
   Found op http://en.wikipedia.org/wiki/Dubnium
   
   
6. 
   dubnium
   dubnium (dOOb'nēum) , artificially produced radioactive chemical element; symbol Db; at. no. 105; mass number of most stable isotope 262; m.p., b.p., and sp. gr. unknown; valence +5. Situated in Group 5 of the periodic table, it has properties similar to those of niobium and tantalum.In 19...
   Found op http://www.infoplease.com/ce6/sci/A0816200.html
   
   
7. 
   dubnium
   Synthesized, radioactive, metallic element of the transactinide series, atomic number 105, relative atomic mass 261. Six isotopes have been synthesized, each with very short (fractions of a second) half-lives. Two institutions claim to have been the first to produce it: the Joint Institute for Nucle...
   Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0053447.html
   
   

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