Darmstadtium
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| General | ||||||
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| Name, Symbol, Number | darmstadtium, Ds, 110 | |||||
| Chemical series | transition metals | |||||
| Group, Period, Block | 10, 7, d | |||||
| Appearance | unknown, probably silvery white or metallic gray | |||||
| Atomic mass | (282) g/mol | |||||
| Electron configuration | perhaps [Rn] 5f14 6d9 7s1 (in analogy to platinum) | |||||
| Electrons per shell | 2, 8, 18, 32, 32, 17, 1 | |||||
| Phase | presumably a solid | |||||
| CAS registry number | 54083-77-1 | |||||
| References | ||||||
Darmstadtium (IPA: /ˌdɑːmˈʃtatiəm/), formerly called ununnilium (IPA: /ˌjuːnuːˈnɪliəm/, symbol Uun) or eka-platinum, is a chemical element with the symbol Ds and atomic number 110. It is one of the so-called super-heavy atoms. This synthetic element quickly decays: its isotopes of mass 267 to 273 have half-lives measured in microseconds. Heavier isotopes, of mass 279 and 281, have been subsequently synthesized and are more stable, with half-lives of 180 milliseconds and 11.1 seconds, respectively.
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[edit] History
Ds was first generated on November 9, 1994 at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany by a team headed by Dr. Jorge Rigol. Only a few atoms of it were prepared by nuclear fusion, involving bombarding a lead target with nickel:<ref>Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.</ref>
- <math>{208 \atop 82}\mathrm{Pb}+{62 \atop 28}\mathrm{Ni}\quad\rightarrow\quad{269 \atop 110}\mathrm{Ds}+{1 \atop 0}\mathrm{n} \; </math>
The element was named after the place of its discovery, Darmstadt (the GSI is located in Wixhausen, a northern portion of the city). The new name was given to it by the IUPAC on August 16, 2003.
[edit] Trivia
Some suggested (for fun) the name policium for the new element, because 110 is the emergency telephone number for the German police.
[edit] References
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[edit] External links
- WebElements.com - Darmstadtium
- IUPAC: Element 110 is named darmstadtium
- Apsidium - darmstadtium
- (German) http://www.darmstadtium.de/index.cfmar:دارمشتادتيوم
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