118Og
Element 118
Oganesson
Noble gases
Oganesson is IUPAC's name for the transactinide element with the atomic number 118 and element symbol Og.
Key data
- Atomic number
- 118
- Atomic mass
- 294.000 u
- Group / Period
- 18 / 7
- Block
- p-block
- Phase at STP
- Solid
- Density
- 4.95 g/cm³
- Melting point
- —
- Boiling point
- 76.9 °C
- Electron configuration
- *[Rn] 5f14 6d10 7s2 7p6
Common uses
- •Research only
- •Heaviest known element
- •Named after Yuri Oganessian
Discovery
Year: 2002
Discovered by: Joint Institute for Nuclear Research
Frequently asked questions
What is the atomic number of Oganesson?
Oganesson has atomic number 118. Its symbol is Og and its atomic mass is 294 u.
What category of element is Oganesson?
Oganesson is classified as noble gases. It sits in group 18, period 7 of the periodic table.
What is Oganesson used for?
Common uses of Oganesson include: Research only, Heaviest known element, Named after Yuri Oganessian.
When was Oganesson discovered?
Oganesson was discovered in 2002 by Joint Institute for Nuclear Research.
Play the game
Test your knowledge in The Lab
20-round element ID, cryptic 3-clue guesser, and an interactive periodic table.
Open The Lab →