SPECTRUM

Chemical Fact Sheet

Roentgenium

Chemical Abstract Number (CAS #) 54386-24-2
Analytical Methods 200.8 - 6020
Atomic Symbol Rg

Synopsis from the CRC Handbook of Chemistry and Physics 92nd Edition 2011-2013

Roentgenium (Wilhelm Roentgen, discoverer of X-rays), Rg. On December 20, 1994, scientists at GSI Darmstadt, Germany announced they had detected three atoms of a new element with 111 protons and 161 neutrons. This element was made by bombarding 83Bi with 28Ni. Signals of Element 111 appeared for less than 0.002 s, then decayed into lighter elements including Element 268109 and Element 264107. These isotopes had not previously been observed. In 2004 IUPAC approved the name roentgenium for Element 111. Roentgenium is expected to have properties similar to gold.
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