1) Chemical element 2) Element discovered in 1967 3) Element number 105 4) Element with the symbol Db 5) Synthetic element
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https://www.crosswordclues.com/clue/dubnium
Dubnium 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 stable known isotope, dubnium-268, has a half-life of approximately 28 hours. I...
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http://en.wikipedia.org/wiki/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]
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http://www.britannica.com/eb/a-z/d/79
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.
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http://www.encyclo.co.uk/local/20728
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.]
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http://www.medilexicon.com/medicaldictionary.php?t=26783
Db noun a transuranic element
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https://www.encyclo.co.uk/local/20974
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 Nuclear Research in Dubna, Russia, in 1967;...
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https://www.encyclo.co.uk/local/21221
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