118 Og
Unknown / predicted
Oganesson
Heaviest known element.
Properties of Oganesson
- Atomic number (Z)
- 118
- Symbol
- Og
- Atomic mass
- 294 g/mol
- Category
- Unknown / predicted
- Group
- 18
- Period
- 7
- Electron configuration
- [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶
- Electronegativity (Pauling)
- —
- Atomic radius
- —
- First ionization energy
- 839 kJ/mol
- Melting point
- 325 K (51.9 °C)
- Boiling point
- 450 K (176.9 °C)
- Density
- 7 g/cm³
- Phase at 25 °C
- Solid
- Discovered
- Discovered in 2002