111 Rg 282
Roentgenium
unknown, probably transition metal
Properties
- Atomic number
- 111
- Atomic mass
- 282 u
- Category
- unknown, probably transition metal
- Group
- 11
- Period
- 7
- Block
- d-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- —
- Density
- 28.7 g/cm³
- Melting point
- —
- Boiling point
- —
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d⁹
Noble-gas shorthand: [Rn] 5f¹⁴ 6d⁹ 7s²
Electrons per shell: 2, 8, 18, 32, 32, 17, 2 — that's 2 in the outermost shell.
About 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.
- Discovered by Gesellschaft für Schwerionenforschung
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.