Roentgenium
Transition Metal
Roentgenium (Rg) is a chemical element with atomic number 111, classified as a transition metal. At room temperature it is a solid. It was discovered in 1994 by Gesellschaft für Schwerionenforschung (GSI).
Properties
- Atomic number
- 111
- Atomic mass
- 282 u
- Category
- Transition Metal
- Group
- 11
- Period
- 7
- Block
- d-block
- Electron configuration
- [Rn] 5f¹⁴ 6d⁹ 7s²
- Phase at STP
- Solid
- Density
- 28.7 g/cm³
- Melting point
- —
- Boiling point
- —
- Electronegativity
- —
- Atomic radius
- —
- Ionization energy
- —
- Discovery
- 1994 · Gesellschaft für Schwerionenforschung (GSI)
Common uses
Research only
Did you know?
Named after Wilhelm Röntgen, discoverer of X-rays.