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, which is 2 in the outermost shell.
Related: electron configuration, the Bohr model, valence electrons.
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
Roentgenium: frequently asked questions
- What is Roentgenium?
- Roentgenium (Rg) is the chemical element with atomic number 111. It is not yet firmly classified; it is listed as "unknown, probably transition metal".
- What is the atomic number of Roentgenium?
- Roentgenium's atomic number is 111, which means every Roentgenium atom has 111 protons in its nucleus.
- What is the electron configuration of Roentgenium?
- The electron configuration of Roentgenium is 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). Its electrons are arranged in shells of 2, 8, 18, 32, 32, 17, 2, with 2 in the outermost shell.
- Is Roentgenium a metal or a nonmetal?
- Roentgenium is not yet firmly classified; it is listed as "unknown, probably transition metal".
- What group and period is Roentgenium in?
- Roentgenium is in group 11 and period 7 of the periodic table.
- Is Roentgenium a solid, liquid, or gas?
- At room temperature, Roentgenium is a solid.
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.