Roentgenium
Roentgenium is a chemical element in the periodic table that has the symbol Rg and atomic number 111. It is a synthetic element whose longest-lived isotope has a mass of 280 and a half-life of 3.6 seconds.
| General | |
|---|---|
| Name, Symbol, Number | roentgenium, Rg, 111 |
| Chemical series | transition metals |
| Group, Period, Block | 11, 7, d |
| Appearance | unknown, predicted colourless |
| Standard atomic weight | [280]g·mol-1 |
| Electrons per shell | 2, 8, 18, 32, 32, 17, 2 |
| Phase | presumably a solid |
| CAS registry number | 54386-24-2 |
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