| Physical properties | Not much is known about element 111, but it is assumed that it is a solid metal that hassome of the properties of its homologues, gold and silver, located just above it in group 1 (IB)in the periodic table. The reaction that produces unununium is as follows:
Bi-209 + Ni-64 + neutrons = Uuu-272 + alpha decay particles.
Only a few atoms of Rg-272 have been produced. Its most stable isotope is Rg-280, with ahalf-life of 3.6 seconds. |
| Isotopes | There are three isotopes of Uuu (R?entgenium). They are Rg-272 (half-life of1.5 milliseconds), Rg-279 (half-life of 170 milliseconds), and Rg 280 (half-life of 3.2seconds), the latter of which is r?entgenium’s most stable isotope. All of its isotopes aresynthetic and unstable. |
| Origin of Name | Named in honor of the scientist Wilhelm Konrad R?entgen. |
| History | 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. |
| Uses | None, except for research purposes. |
| Definition | roentgenium: Symbol Rg. A radioactivetransactinide; a.n. 111. It wasmade by fusion of 209Bi with 64Ni.Only a few atoms have been detected. |
| Definition | A radioactive
element produced synthetically. It is
named for Wilhelm Roentgen
Symbol: Rg; p.n. 111. |
| Hazard | Unununium (r?entgenium) is not a public radiation hazard given that only a few atomshave been produced synthetically in nuclear laboratories and they do not exist over long periodsof time. |