Roentgenium



111 ununbium
Au
↑
Rg
↓
(Uhu)
General
Number roentgenium, Rg, 111
transition metals
Block d
Appearance unknown, probably yellow or
orange metallic
Standard atomic weight 284 g·mol−1
gold)
shell 2, 8, 18, 32, 32, 18, 1
Phase presumably a solid
CAS registry number 54386-24-2
Selected isotopes
Main article: Isotopes of roentgenium
iso NA half-life DM DE (MeV) DP
280Rg syn 3.6 s
References

Roentgenium (transition metal.

History

It was discovered by Peter Armbruster, Gottfried Münzenber, and their team working at the Gesellschaft für Schwerionenforschung (GSI) in linear accelerator (Nickel was bombarded onto the bismuth target):

\,^{209}_{83}\mathrm{Bi} + \,^{64}_{28}\mathrm{Ni} \, \to \,^{272}_{111}\mathrm{Rg} + \; ^1_0\mathrm{n} \;

The name roentgenium was accepted as a permanent name on November 1 2004 in honor of gold.

Isotopes

Twelve alpha decay and has a half-life of 3.6 seconds. The shortest-lived isotope is 272Rg, which decays through alpha decay and has a half life of 1.5 ms. Another known isotope, 279Rg, decays through alpha decay and has a half-life of 170 ms.

See also

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Roentgenium". A list of authors is available in Wikipedia.