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