111 Rg
Unknown / predicted
Roentgenium
Named after Röntgen.
Properties of Roentgenium
- Atomic number (Z)
- 111
- Symbol
- Rg
- Atomic mass
- 282 g/mol
- Category
- Unknown / predicted
- Group
- 11
- Period
- 7
- Electron configuration
- [Rn] 5f¹⁴ 6d⁹ 7s²
- Electronegativity (Pauling)
- —
- Atomic radius
- —
- First ionization energy
- 1020 kJ/mol
- Melting point
- —
- Boiling point
- —
- Density
- 28.7 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 1994
Frequently asked questions
What is Roentgenium?
Roentgenium (Rg) is an unknown / predicted, element number 111 on the periodic table. Named after Röntgen.
What is the atomic number and atomic mass of Roentgenium?
Roentgenium has atomic number 111 and an atomic mass of about 282 g/mol.
What is the electron configuration of Roentgenium?
The electron configuration of Roentgenium is [Rn] 5f¹⁴ 6d⁹ 7s².
Where is Roentgenium on the periodic table?
Roentgenium sits in group 11, period 7, and is classified as a unknown / predicted.