The Element Roentgenium
[Click for Isotope Data]
Atomic Number: 111
Atomic Weight: 281
Melting Point: Unknown
Boiling Point: Unknown
Phase at Room Temperature: Expected to be a Solid
Element Classification: Metal
Period Number: 7 Group Number: 11 Group Name: none
Radioactive and Artificially Produced
What's in a name? Named after the scientist Wilhelm Conrad Röentgen.
Say what? Roentgenium is pronounced as RENT-ghen-ee-em.
History and Uses:
Roentgenium was first produced by Peter Armbruster, Gottfried Münzenber and their team working at the Gesellschaft für Schwerionenforschung in Darmstadt, Germany in late 1994. They bombarded atoms of bismuth-209 with ions of nickel-64 with a device known as a linear accelerator. This produced three atoms of roentgenium-272, an isotope with a half-life of about 1.5 milliseconds (0.0015 seconds), and a free neutron.
Roentgenium's most stable isotope, roentgenium-281, has a half-life of about 26 seconds and decays through spontaneous fission.
Since only a few atoms of roentgenium have ever been produced, it currently has no uses outside of basic scientific research.
Estimated Crustal Abundance: Not Applicable
Estimated Oceanic Abundance: Not Applicable
Number of Stable Isotopes: 0 (View all isotope data)
Ionization Energy: Unknown
Oxidation States: Unknown
3s2 3p6 3d10
4s2 4p6 4d10 4f14
5s2 5p6 5d10 5f14
6s2 6p6 6d10