Chemical element · Atomic number 118
Oganesson
Oganesson in the periodic table: atomic number 118, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Noble gas
expected to be gaseous
[295.216] u
Generated illustrationGenerated illustration, Quanta Study. Not a photograph of a sample.
Generated illustration of Oganesson; the image does not show a sample of the element.
Synthetic element produced a few atoms at a time; there is no visible sample.
Code-native illustration with the Quanta Study mark inside the image; not a photograph, no AI model involved.
Atomic classification
Shell occupancy
Oganesson in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 32 electrons
- O · n=5
- 32 electrons
- P · n=6
- 18 electrons
- Q · n=7
- 8 electrons
- Electron configuration
- [Rn]7s2 7p6 5f14 6d10 (predicted)
- Electrons per shell
- 2 · 8 · 18 · 32 · 32 · 18 · 8
- Group
- 18
- Period
- 7
- Block
- P
- Element category
- Noble gas
Physical and chemical properties
- Atomic mass
- [295.216] u
- Standard state
- expected to be gaseous
- Density
- not reported
- Melting point
- not reported
- Boiling point
- not reported
- Electronegativity
- not reported
- First ionisation energy
- not reported
- Oxidation states
- +6, +4, +2, +1, 0, -1
- Discovery
- 2006
Safety and periodic classification
Safety
Safe handling cannot be inferred from Oganesson's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Oganesson is in period 7, group 18 and the P block. Its direct predecessor by atomic number is Tennessine. The snapshot does not report a Pauling electronegativity. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.
Where Oganesson sits among the 118 elements
The table compares the reported values for Oganesson with every other element that carries the same value in the snapshot. A rank is not a judgement, it is orientation: it says how unusual this value is across the periodic table.
The snapshot reports no measured material data for Oganesson. That is normal for the heaviest elements, which exist only in minute quantities, and it is stated here instead of showing estimates.
All values and ranks come from the PubChem Periodic Table snapshot, retrieved on 2026-07-15. Elements without a reported value are excluded, so the population differs per row.
The neighbours of Oganesson in the periodic table
- Place in the table
- Group 18, period 7, P block. Classified as noble gas, expected to be gaseous at standard conditions.
- Direct neighbours
- Atomic number 118. Preceded by Tennessine, followed by no element.
- Same group
- Same number of outer electrons, and therefore similar reactivity to Helium, Neon, Argon, Krypton, Xenon, Radon.
- Discovery
- Recorded in the snapshot as: 2006. Who, where and under what circumstances is not part of that record, so this page carries the sourced year and no discovery narrative.
- Oxidation states
- +6, +4, +2, +1, 0, -1. They follow from the electron configuration [Rn]7s2 7p6 5f14 6d10 (predicted) and indicate which compounds to expect.
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