Roentgenium was discovered in 1994 by scientists at the Heavy Ion Research Laboratory in Darmstadt, Germany. The name roentgenium was coined in honor of the German physicist Wilhelm Conrad Röntgen and in 2004 this name was formally accepted as a permanent name for this element.
Basic Information
| Name |
Roentgenium |
| Symbol |
Rg |
| Atomic number |
111 |
| Atomic weight |
[ 280 ] |
| Standard state |
presumably a solid at 298 K |
| CAS Registry ID |
54386-24-2 |
| Group in periodic table |
11 |
| Group name |
(none) |
| Period in periodic table |
7 |
| Block in periodic table |
d-block |
| Color |
unknown, but probably metallic and silvery white or grey in appearance |
| Classification |
Metallic |
| Melting point |
Unknown |
| Boiling point |
Unknown |
| Density |
Unknown |
| Phase at room temperature |
Expected to be a Solid |
Occurrence
Roentgenium is a man-made element and is not found in any natural environment on Earth.
Roentgenium - Periodic Table of Videos
Isotopes
Roentgenium has 7 isotopes whose half-lives are known with mass numbers from 272 to 282. None of these isotopes are stable except for isotope is 281Rg that is considered as the most stable isotope with a half-life of 23 seconds.
Production
The Roentgenium that is available is produced through nuclear bombardment. 209Bi is bombarded with 64Ni in a heavy ion accelerator to produce this synthetic radioactive metal called roentgenium.
Applications
Roentgenium is currently used only in basic scientific research applications.
Sources and Further Reading
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