118
Og
Oganesson
294
Oganesson (Og)
Noble GasGroup 18Period 7p-block-blockRadioactive
Oganesson is IUPAC's name for the transactinide element with the atomic number 118 and element symbol Og. It is also known as eka-radon or element 118, and on the periodic table of the elements it is a p-block element and the last one of the 7th period. Oganesson is currently the only synthetic member of group 18.
Latin name: Oganesson
Atomic Number
118
Atomic Mass
294 g/mol
Phase (STP)
Solid (predicted)
Electron Config.
[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ (predicted)
General
SymbolOg
Atomic Number118
Atomic Mass294 g/mol
CategoryNoble Gas
Group18
Period7
Blockp-block
Electron Configuration[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ (predicted)
Valence Electrons18
Colourunknown (predicted)
Physical Properties
Phase (STP)Solid (predicted)
Densitypredicted ~4 g/cm3
Melting Pointpredicted ~325 K
Boiling Pointpredicted ~350 K
Atomic Properties
Oxidation States+2, +4, +6
Ion ChargeOg2+/Og4+/Og6+
Nuclear & Hazards
RadioactiveYes
Half-life0.7 milliseconds (Og-294)
Abundance
In Earth's Crust0%
Discovery & History
Discovery Year2002
Discovered ByJoint Institute for Nuclear Research (Dubna) and Lawrence Livermore National Laboratory
Country of DiscoveryRussia/USA
Isotopes of Oganesson
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Og-294 | — | ~0.7 milliseconds | SF, α |