Element 118
Oganesson (Og)
Oganesson (Og) is element 118 of the periodic table, a element with unclassified properties in period 7, group 18 (p-block) with an atomic mass of 294 and is a solid at standard conditions.
At a glance
- Atomic number
- 118
- Symbol
- Og
- Atomic mass
- 294 u
- Category
- Unclassified properties
- Period
- 7
- Group
- 18
- Block
- p-block
- Phase at STP
- solid
Electron structure
- Electron configuration
- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6p6 5f14 6d10 7s2 7p6
- Shorthand configuration
- [Rn] 5f14 6d10 7s2 7p6
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 8
- Oxidation states
- -1, 0, +1, +2, +4, +6
Physical properties
- Melting point
- 325 K
- Boiling point
- 450 K
- Density
- 5 g/cm3
- Phase
- solid
Atomic properties
- Covalent radius
- 157 pm
- First ionization energy
- 839 kJ/mol
- Electron affinity
- 5.4 kJ/mol
Notable isotopes
| Isotope | Mass | Abundance | Stability |
|---|---|---|---|
| Og-294 | 294.21392 | — | Half-life 0.7 ms |
Common uses
- Scientific research only
Discovery
- Year
- 2002
- Discovered by
- Joint Institute for Nuclear Research, Lawrence Livermore National Laboratory
- Country
- Russia/USA