Roentgenium: the essentials Roentgenium, was discovered on 8th
December 1994 at the GSI in Darmstadt, Germany. Further
information on element 111 is here (outside WebElements). The
information following is an abstract of this source. The
interested reader should consult the on-line version of The
Wonderful World of Atoms and Nuclei for a fascinating insight
into research on "super-heavy" atoms. Chemically, roentgenium
should be in the same group as the elements copper, silver, and
gold (Group 11). Roentgenium: historical information Element
111, roentgenium, was discovered towards the end of 1994 at the
GSI in Darmstadt, Germany. Three atoms of an isotope 272Uuu were
produced in reactions between 209Bi targets and 64Ni
projectiles. To achieve this, the nickel atoms were accelerated
to high energies by the heavy ion accelerator UNILAC at GSI and
directed onto a lead target. Roentgenium: physical properties
Roentgenium: orbital properties Isolation: only a few atoms of
element 111, roentgenium, have ever been m