111Rg282
Roentgenium
Unknown properties · element 111 · group 11, period 7
Quick facts
| Symbol | Rg |
|---|---|
| Atomic number | 111 |
| Relative atomic mass | 282 |
| Category | Unknown properties |
| Position | group 11, period 7 |
| State at 20 °C | Unknown (too few atoms have been made) |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity | — |
| Electron configuration | [Rn] 5f14 6d9 7s2 |
About Roentgenium
Roentgenium has the symbol Rg and atomic number 111, which means every roentgenium atom has 111 protons in its nucleus and, in a neutral atom, 111 electrons. At room temperature it is unknown (too few atoms have been made).
Only a few atoms of this element have ever been made, in particle accelerators, so most of its properties are predicted rather than measured.
Explore it
See where roentgenium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.