Oganesson (Og)
Oganesson (Og) is element 118 of the periodic table, a noble gas in period 7 and group 18. It has no stable isotope and no standard atomic weight; 294 is the mass number of its longest-lived isotope. Its properties are predicted rather than measured: it is expected to be a gas at room temperature.
| Atomic number | 118 |
|---|---|
| Symbol | Og |
| Standard atomic weight | [294] (mass number of the longest-lived isotope) |
| Molar mass | [294] g/mol |
| Category | Noble gas |
| Group | 18 |
| Period | 7 |
| Block | p-block |
| Electron configuration | [Rn] 7s2 7p6 5f14 6d10 (predicted) |
| Oxidation states | +6, +4, +2, +1, 0, −1 |
| Electronegativity (Pauling) | — |
| Atomic radius (van der Waals) | — |
| First ionisation energy | — |
| Electron affinity | — |
| State at room temperature | Gas (predicted) |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Discovered | 2006 |
Group 18
Calculate with Oganesson
Atomic weight: IUPAC CIAAW — no standard atomic weight; mass number in brackets. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.