Bohrium Chemische Eigenschaften,Einsatz,Produktion Methoden
Physikalische Eigenschaften
Unnilseptium, or bohrium, is artificially produced one atom at a time in particle accelerators.In 1976 Russian scientists at the nuclear research laboratories at Dubna synthesizedelement 107, which was named unnilseptium by IUPAC. Only a few atoms of element 107were produced by what is called the “cold fusion” process wherein atoms of one element areslammed into atoms of a different element and their masses combine to form atoms of a newheavier element. Researchers did this by bombarding bismuth-204 with heavy ions of chromium-54 in a cyclotron. The reaction follows: Bi-209 + Cr-54 + neutrons = (fuse to form)Uns-262 + an alpha decay chain.
The melting point, boiling point, and density of element 107, as well as some other properties,are not known because of the small number of atoms produced.
Isotopes
There are a total of 10 isotopes of unnilseptium (bohrium). Not all their half-livesare known. However, the ones that are known range from 8.0 milliseconds to 9.8 secondsfor Bh-272, which is the most stable isotope of bohrium and which decays into dubnium-268 through alpha decay. Only one isotope, Uns-261, has a decay mode that involvesboth alpha decay and spontaneous fission. All the others decay by alpha emission.
Origin of Name
Named after the scientist Niels Bohr.
History
Bohrium was discovered in 1976 by a team of scientists in Dubna, Russia, by bombarding bismuth-204 (204Bi) with a heavy nucleus of chromium-54 (54Cr). They published the results of this successful experiment and submitted a declaration of discovery. Later, in 1981, Peter Ambrüster, Gottfried Münzenberg, and their team in Darmstadt, Germany, confirmed the discovery, successfully preparing a single-atom isotope of bismuth-262. Subsequently, the International Union of Pure and Applied Chemistry (IUPAC) named this element bohrium.
Verwenden
None, except for research purposes.
Definition
bohrium: Symbol Bh. A radioactivetransactinide element; a.n. 107. Itwas first made in 1981 by Peter Armbrusterand a team in Darmstadt,Germany, by bombarding bismuth-209 nuclei with chromium-54 nuclei.Only a few atoms of bohrium haveever been detected.
Hazard
Even though most isotopes of unnilseptium are alpha emitters, there is little radiationhazard because only a few atoms have been produced.
Bohrium Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
