Oganesson (Og) – element 118
Oganesson is a chemical element with the symbol Og and atomic number 118. It is a unknown (predicted to be noble gas) in group 18 (noble gases), period 7 of the periodic table (p-block), and is a solid at room temperature.
Oganesson (Og) has atomic number 118, atomic mass [294] and electron configuration *[Rn] 5f14 6d10 7s2 7p6.
Oganesson facts
| Symbol | Og |
|---|---|
| Atomic number | 118 |
| Atomic mass | [294] |
| Category | unknown (predicted to be noble gas) |
| Group | group 18 (noble gases) |
| Period | 7 |
| Block | p-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6 |
| Noble-gas notation | *[Rn] 5f14 6d10 7s2 7p6 |
| Electrons per shell | 2, 8, 18, 32, 32, 18, 8 |
| Valence electrons | 8 |
Bohr model and shells
Oganesson has 118 electrons in 7 shells: 2, 8, 18, 32, 32, 18, 8. Full configuration and noble-gas notation are in the table; work out any element or ion with the electron configuration calculator.
Physical and atomic properties
| Boiling point | 350 K (76.9 °C) |
|---|---|
| Density | 4.95 g/cm³ |
| Electron affinity | 5.40318 kJ/mol |
| Discovered by | Joint Institute for Nuclear Research |
Use the atomic mass in the molar mass calculator for any formula containing Og.
Position in the periodic table
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Frequently asked questions
What is the atomic mass of oganesson?
The atomic mass of oganesson is [294] (mass number of its longest-lived isotope, since it has no stable isotope).
What is the electron configuration of oganesson?
Oganesson has 118 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d¹⁰ 7p⁶, or *[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ in noble-gas notation. Electrons per shell: 2, 8, 18, 32, 32, 18, 8.
How many valence electrons does oganesson have?
Oganesson has 8 valence electrons (group 18).
Is oganesson a metal?
No. Oganesson is a nonmetal (unknown (predicted to be noble gas)).
Where is oganesson on the periodic table?
Oganesson is in group 18 (noble gases), period 7, in the p-block.
Data: Periodic-Table-JSON (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.