Unknown
Oganesson
The heaviest element yet made, capping the noble-gas column.
Atomic #118Mass[294]Blockp-blockPeriod7Group18
Og118 · [294]
3D Atom Explorer
Inside the Oganesson atom
Switch between Bohr and Quantum Cloud modes to compare a simple teaching model with a more realistic probability-based view, and follow the guided tour to explore the Oganesson atom step by step.
Loading 3D atom…
Electron configuration
[Rn] 5f14 6d10 7s2 7p6
A neutral Oganesson atom has 118 electrons (equal to its proton count). Choosing a different isotope above changes only the neutron count.
Shell distribution
Shell 12 e⁻Shell 28 e⁻Shell 318 e⁻Shell 432 e⁻Shell 532 e⁻Shell 618 e⁻Shell 78 e⁻
Electrons fill inner shells before outer ones; the outermost (valence) shell drives the element's chemistry.
Properties
Physical & atomic properties
- State (room temp)
- Unknown
- Melting point
- —
- Boiling point
- —
- Density
- —
- Electronegativity
- —
- Atomic radius
- —
- 1st ionization energy
- —
- Category
- Unknown
History
Discovery & naming
- Discovered
- 2002
- Discovered by
- Dubna–Livermore collaboration
- Origin of name
- Physicist Yuri Oganessian.
Notable uses
Scientific research only.
Cosmic origin
Where Oganesson comes from
Human synthesis
The heaviest element yet made. Only a handful of atoms have ever existed.
Simplified origin map — many elements form through more than one astrophysical pathway.
Summary
- Atomic number
- 118
- Atomic mass
- [294]
- Category
- Unknown
- Group · Period
- 18 · 7
- Block
- p-block
- Shells
- 2 · 8 · 18 · 32 · 32 · 18 · 8