1) Chemical element 2) Element discovered in 1984 3) Element number 108 4) Element with the symbol Hs 5) Synthetic element
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https://www.crosswordclues.com/clue/hassium
Hassium is a chemical element with symbol Hs and atomic number 108, named in honor of the German state of Hesse. 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, 269Hs, has a half-life of approximately 9.7 seconds, although an unconfirmed metastabl...
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http://en.wikipedia.org/wiki/Hassium
an artificially produced element belonging to the transuranium group, atomic number 108. It was synthesized and identified in 1984 by West German ...
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http://www.britannica.com/eb/a-z/h/22
Type: Term Pronunciation: hahs′ē-ŭm Definitions: 1. An artificial transplutonium element; atomic number 108; atomic weight 265. [Formerly called Unniloctium, Uno; and Hahnium, after German physicist O. Hahn.]
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http://www.medilexicon.com/medicaldictionary.php?t=39297
Synthesized, radioactive element of the transactinide series, atomic number 108, relative atomic mass 265. First synthesized in 1984 by the Laboratory for Heavy-Ion Research in Darmstadt, Germany, it was known by the temporary name unniloctium until 1997
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https://www.encyclo.co.uk/local/21221
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