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Author: langbot
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English[en]
Roentgenium is a chemical element with the symbol Rg and atomic number 111. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature. The most stable known isotope, roentgenium-282, has a half-life of 100 seconds, although the unconfirmed roentgenium-286 may have a longer half-life of about 10.7 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany. It is named after the physicist Wilhelm Röntgen (also spelled Roentgen), who discovered X-rays. Only a few roentgenium atoms have ever been synthesized, and they have no current practical application beyond that of scientific study.
Cornish[kw]
Elven gymyk synthetek yw roentgeniom, niver 111 y'n Vosen Beriodek. Y furvell gymyk yw Rg. An hanow a enor an fysegydh a Almayn, Wilhelm Röntgen, neb a dhiskudhas dewynnow-X yn 1895. Ny gevys yw yn naturel. Pur radyoweythresek yw, an isotop gans an hanter-bewnans hirra yw roentgeniom-282 (100 eylen). Gwrys veu rag an kynsa prys yn 1994 yn Arbovji GSI yn Darmstadt, Almayn.