117Ts
118Og
Atomic number 118
Oganesson
Noble gas
No photo: here’s why
Oganesson is a synthetic element made only in vanishingly small, intensely radioactive amounts - its atoms decay so quickly that no piece big enough to see or photograph has ever existed.
Quick facts
- Atomic mass
- 294.00
- Group
- 18
- Period
- 7
- State (STP)
- unknown
- Electronegativity
- –
- Common ox. states
- 0, +2, +4
Properties
Electron configuration
[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶
- Ionization energy
- –
- Electron affinity
- –
- Melting point
- –
- Boiling point
- –
How dangerous is it?
5/5 · Extreme
The heaviest element ever made and nominally a noble gas, it has only been seen as a few atoms that decay within a fraction of a second.
- RadioactiveImmediate
It is extraordinarily radioactive in principle, but the atoms vanish far too fast for any real quantity to exist.
Built and observed only inside accelerator labs using remote, shielded equipment.
How it bonds· family overview
Oganesson (Og) is a synthetic super-heavy element predicted to behave like a noble gas - closed-shell, mostly inert - though enough atoms to test this haven't been made.
