86Rn
Element 86
Radon
Noble gases
Radon is a chemical element with symbol Rn and atomic number 86.
Key data
- Atomic number
- 86
- Atomic mass
- 222.000 u
- Group / Period
- 18 / 6
- Block
- p-block
- Phase at STP
- Gas
- Density
- 9.73 g/cm³
- Melting point
- -71.1 °C
- Boiling point
- -61.6 °C
- Electron configuration
- [Xe] 4f14 5d10 6s2 6p6
Common uses
- •Radon-gas testing
- •Cancer therapy (historical)
- •Radioactive
Discovery
Year: 1900
Discovered by: Friedrich Ernst Dorn
Frequently asked questions
What is the atomic number of Radon?
Radon has atomic number 86. Its symbol is Rn and its atomic mass is 222 u.
What category of element is Radon?
Radon is classified as noble gases. It sits in group 18, period 6 of the periodic table.
What is Radon used for?
Common uses of Radon include: Radon-gas testing, Cancer therapy (historical), Radioactive.
When was Radon discovered?
Radon was discovered in 1900 by Friedrich Ernst Dorn.
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 →