|Block||d||Density (g cm−3)||Unknown|
|Atomic number||111||Relative atomic mass|||
|State at 20°C||Solid||Key isotopes||280Rg|
|Electron configuration||[Rn] 5f146d107s1||CAS number||54386-24-2|
|ChemSpider ID||–||ChemSpider is a free chemical structure database|
- Roentgenium(Rg) is a radioactive element created artificially (extremely radioactive synthetic element) and not found in nature.
- The element was discovered by Peter Armbruster and Gottfried Münzenberg in the year 1994.
- It is a D-block transactinide element in the periodic table.
- The element can be used as a synthetic metal within average quantities.
- It is mainly used for research purposes at present.
- The element has a metallic gold (yellow solid) appearance.
- The element has around 7 isotopes whose half-lives are known, with mass numbers from 272 to 282.
- One of the isotopes of this element (218Rg) has a half-life of 26 seconds.
- The element undergoes decay under spontaneous fission process.
- The element was named after Wilhelm Röntgen (founder of X-rays).
- It was synthesized for the first time by Hofmann and Sigurd at the Institute for Heavy Ion Research in Germany in the year 1994.
- The element can be formed artificially by bombarding the ions of bismuth with the ions of nickel in a linear accelerator.