Og
Oganesson
Element 118 · Noble gas
Oganesson (Og)
Oganesson is the heaviest element known. Though in the noble gas group, it is predicted to be a reactive solid.
- Noble gas
- Period 7
- Group 18
- p-block
- gas at room temperature
- ☢ Radioactive
Key properties
- Atomic mass
- [295]
- u
- Electron configuration
- [Rn] 5f14 6d10 7s2 7p6
- Melting point
- —
- Boiling point
- 76.9 °C
- 350 K
- Density
- 4,950 g/L
- Electronegativity
- —
- Atomic radius
- —
- 1st ionisation energy
- —
Superheavy elements have only been made a few atoms at a time. Most properties shown are theoretical predictions.
Compare with every element:Electronegativity chartAtomic radius chartIonisation energy chartDensity chart of the elementsMelting point chartElectron configuration chart
Did you know?
Notable facts about oganesson
- 01
Only five or six atoms have ever been confirmed.
- 02
It is one of only two elements named after a living person, along with seaborgium.
- 03
Relativistic effects may make it a semiconductor rather than a gas.
Applications
What is oganesson used for?
- Research
History
Discovery & name origin
Discovered by
Year
Where
Russia and United States
Name origin
From Yuri Oganessian, leader of the team that discovered it.
Atomic structure
Atomic properties
Atomic structure
Atomic properties
- Atomic number
- 118
- Atomic mass
- [295] u
- Group
- 18
- Period
- 7
- Block
- p-block
- Electron configuration
- [Rn] 5f14 6d10 7s2 7p6
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6
- Electrons per shell
- 2, 8, 18, 32, 32, 18, 8
- Electronegativity (Pauling)
- —
- Electron affinity
- —
- Atomic radius (van der Waals)
- —
- Stable isotopes
- None — all isotopes are radioactive
Oxidation states
Highlighted: common oxidation states (+6, +4, +2, +1, 0, -1).
Physical
Physical properties & colour
Physical
Physical properties & colour
- State at 20 °C
- Gas (predicted)
- Melting point
- —
- Boiling point
- 350 K · 76.9 °C · 170.3 °F
- Density
- 4,950 g/L
- Molar heat capacity
- —
- Appearance
- —
- CPK model colour
- —
The CPK colour is the convention used for this element’s atoms in molecular models.
FAQ
Oganesson questions
What is Og on the periodic table?
Og is the symbol for oganesson, element 118 on the periodic table. It sits in group 18, period 7, in the noble gas category, and has an atomic mass of [295].
What is the atomic number of oganesson?
Oganesson has atomic number 118, so every oganesson atom has 118 protons in its nucleus. Its symbol is Og and its atomic mass is [295].
Who discovered oganesson?
Oganesson was discovered by Yuri Oganessian in 2002 (Russia and United States). The name comes from from Yuri Oganessian, leader of the team that discovered it.
What is oganesson used for?
Oganesson is used for: research.
Is oganesson a metal?
No. Oganesson is classed as a noble gas.
What is the electron configuration of oganesson?
The electron configuration of oganesson is [Rn] 5f14 6d10 7s2 7p6 (predicted). Its 118 electrons are arranged in shells as 2, 8, 18, 32, 32, 18, 8.