Darmstadium ( " eka- platinum ") is an exclusively artificially produced chemical element with the chemical symbol Ds and atomic number 110, it is one of the Transactinoiden (7th period, D- block ).
Darmstadium was first produced on 9 November 1994 at the Society for Heavy Ion Research (GSI ) in Darmstadt by Peter Armbruster and Gottfried coins mountain, headed by Sigurd Hofmann. The new element was created artificially by fusing a lead and a nickel ion. The core of the isotope 269Ds was created by fusion of 208Pb with 62Ni with the emission of a neutron:
In the meantime, have 14 different isotopes of Darmstadium be generated with atomic masses 267-282. The half-lives vary from 3.1 microseconds ( 267Ds ) to 1.1 min ( 282Ds ).
By the end of 2011, only a few dozen atoms of element were produced.
The first valid name Ununnilium (symbol Uun ) of the element is derived from the Latin name of its atomic number 110. On 15 August 2003, the name Darmstadium of the International Union of Pure and Applied Chemistry (IUPAC) has been accepted. In honor of the Darmstadt Society for Heavy Ion Research, who discovered and produced six new elements, 2003 Ununnilium was officially christened Darmstadium (Ds ) on 2 December. Darmstadt is thus the only German city, after an item has been designated.
Classifications according to the Hazardous Substances Ordinance are not available because they only include the chemical danger and play a very minor role compared to the risks based on the radioactivity. Even the latter applies only if there is a relevant material for this amount.
Opened in 2007, Science and Congress Centre in Darmstadt was named darmstadtium by this element.