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 110 meitnerium ← darmstadtium → roentgenium Pt↑Ds↓(Uhn)
General
Name, Symbol, Number darmstadtium, Ds, 110
Chemical series transition metals
Group, Period, Block 10, 7, d
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (282)  g·mol−1
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
Selected isotopes
iso NA half-life DM DE (MeV) DP
281Ds syn 11 s
References

Darmstadtium (pronounced /dɑrmˈʃtætiəm/), formerly called ununnilium (/ˌjuːnənˈnɪliəm/, 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 darmstadtium, of mass 279 and 281, were synthesized later and are more stable, with half-lives of 180 milliseconds and 11.1 seconds, respectively.

## History

Darmstadtium was first created on November 9, 1994 at the Gesellschaft für Schwerionenforschung (GSI) in Arheiligen, a northern suburb of Darmstadt, Germany by Peter Armbruster and Gottfried Münzenberg, under the direction of professer Sigurd Hofmann. A few atoms of it were produced by a nuclear fusion reaction caused by bombarding a lead target with nickel:[1]

$\,^{208}_{82}\mathrm{Pb} + \,^{62}_{28}\mathrm{Ni} \, \to \,^{269}_{110}\mathrm{Ds} + \; ^1_0\mathrm{n} \;$

The element was named after the place of its discovery, Darmstadt. The new name was given to it by the IUPAC on August 16, 2003.

Because the telephone number of the police is 110 within Germany, the element has also earned the nickname of "policium".