111Unknown
Rg 280 Atomic mass · uTransition metals
Roentgenium
Roentgenium is a chemical element with symbol Rg and atomic number 111. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, roentgenium-282, has a half-life of 2.1 minutes. Roentgenium was first created in 1994 by the GSI Helmholtz Centre for Heavy Ion Research near Darmstadt, Germany.
Discovery 1994 (Gesellschaft für Schwerionenforschung)
K2L8M18N32O32P17Q2
Physical properties
Values for the element in its standard state.
- Density
- Not available
- Melting point
- Not available
- Boiling point
- Not available
- Atomic radius
- Not available
- Bonding type
- Not recorded
- Molar heat
- Not available
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 6 electrons; 5f, 14 electrons; 6d, 10 electrons; 7s, 1 electrons;
[Rn] represents 86 core electrons. The full view shows them explicitly.
111 electrons Orbital order preserved from source
- Electronegativity
- Not availablePauling scale
- First ionization energy
- Not available
- Electron affinity
- Not available
- Van der Waals radius
- Not available
Rg RoentgeniumAtomic number 111
UnknownkJ/mol
Atomic numberGaps indicate unavailable data
About roentgenium
- Appearance
- Not recorded
- Discovery
- 1994 (Gesellschaft für Schwerionenforschung)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.