Periodic TableOganesson (Og)
Oganesson is a noble gas with atomic number 118, in period 7 and group 18 of the periodic table. Its atomic mass is 294 u and its electron configuration is [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶.
Key facts
| Atomic number | 118 |
|---|---|
| Atomic mass | 294 u |
| Category | Noble Gas |
| Period | 7 |
| Group | 18 |
| Block | p |
| Electron configuration | [Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 8 |
| Electronegativity (Pauling) | --- |
| Oxidation states | −1, +1, +2, +4, +6common in bold |
| State at 25 °C | --- |
| Melting point | --- |
| Boiling point | --- |
| Density | 7.2 g/cm³ |
Atomic properties
| First ionization energy | --- |
|---|---|
| Electron affinity | --- |
| Atomic radius | --- |
| Covalent radius | --- |
| Van der Waals radius | --- |
| Common ions | --- |
| Protons, neutrons, electrons | 118, 176, 118 |
Physical and thermal properties
| Molar volume | 58 cm³/mol |
|---|---|
| Heat of fusion | --- |
| Heat of vaporization | --- |
| Specific heat | --- |
| Thermal conductivity | --- |
| Thermal expansion | --- |
| Mohs hardness | --- |
| Young’s modulus | --- |
| Crystal structure | Face-centered cubic |
| Magnetic type | --- |
Identification and history
| CAS number | 54144-19-3 |
|---|---|
| Latin name | Oganesson |
| Discovered by | JINR, LLNL · 2002 |
| Named by | --- |
Natural isotopes
Oganesson has no stable isotopes: every isotope is radioactive.
No visible amount of Oganesson has ever been made: its physical properties here are theoretical estimates, not measurements.
Data checked against PubChem (NIH), IUPAC, the NIST Atomic Spectra Database and the IAEA (NUBASE and AME), the same data you see in the app.
A dash (---) means there is no reliable published measurement. The app never makes one up.
See Oganesson in the app
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