Discovery date : 1994
Discovered by: Sigurd Hofmann, Peter Armbruster and Gottfried Münzenberg
Origin of the name: Darmstadtium is named after Darmstadt, Germany,
where the element was first produced.
Allotropes :
~>DARMSTADTIUM is a synthetic chemical element with symbol Ds and atomic number 110. It is an extremely radioactive synthetic element. The most stable known isotope, darmstadtium-281, has a half-life of approximately 10 seconds.
| FACT BOX | |||
| Group | 10 | Melting point | Unknown |
| Period | 7 | Boiling point | Unknown |
| Block | d | Density (g cm−3) | Unknown |
| Atomic number | 110 | Relative atomic mass | [281] |
| State at 20°C | Solid | Key isotopes | 281Ds |
| Electron configuration | [Rn] 5f146d97s1 | CAS number | 54083-77-1 |
| ChemSpider ID | - | ChemSpider is a free chemical structure database | |
There are 15 known isotopes of darmstadtium, isotopes 267-281, and the heaviest is the longest-lived, with a half-life of 4 minutes.
There were several attempts to make element 110 at the Joint Institute for Nuclear Research (JINR) at Dubna in Russia, and at the German Geselleschaft für Schwerionenforschung (GSI) at Darmstadt, but all were unsuccessful. Then Albert Ghiorso and his team at the Lawrence Berkeley National Laboratory (LBNL), California, obtained isotope 267 by bombarding bismuth with cobalt, but they could not confirm their findings.
In 1994, a team headed by Yuri Oganessian and Vladimir Utyonkov at the JINR made isotope-273 by bombarding plutonium with sulfur. The same year, a team headed by Peter Armbruster and Gottfried Munzenberg at the GSI bombarded lead with nickel and synthesised isotope 269. The latter group’s evidence was deemed more reliable and confirmed by others around the world, so they were allowed to name element 110.