Roentgenium

chemical element

Nov 9, 2024 - 03:16
 0  6

chemical properties of roentgenium (unununium) (part of Periodic Table of the Elements imagemap)

roentgenium (Rg), artificially produced transuranium element of atomic number 111. In 1994 scientists at the Institute for Heavy Ion Research (Gesellschaft für Schwerionenforschung [GSI]) in Darmstadt, Ger., formed atoms of element 111 when atoms of bismuth-209 were bombarded with atoms of nickel-62. The atoms of element 111 had an atomic weight of 272 and decayed after 1.5 milliseconds into atoms of meitnerium-268 by emitting an alpha particle (helium nucleus). Element 111 was named roentgenium after the German physicist Wilhelm Röntgen, the discoverer of X-rays. The longest-lasting isotope, roentgenium-280, has a half-life of 3.6 seconds and decays to meitnerium-276. Roentgenium’s chemical properties may be similar to those of gold.

Element Properties
atomic number111
atomic weight280
electron config.[Rn]5f146d107s1

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