86 Rn 222
Radon
Noble Gas
Radon (Rn) is a chemical element with atomic number 86, classified as a noble gas. At room temperature it is a gas. It was discovered in 1900 by Friedrich Ernst Dorn.
Properties
- Atomic number
- 86
- Atomic mass
- 222 u
- Category
- Noble Gas
- Group
- 18
- Period
- 6
- Block
- p-block
- Electron configuration
- [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶
- Phase at STP
- Gas
- Density
- 9.73 g/L
- Melting point
- 202 K (-71.1 °C)
- Boiling point
- 211.3 K (-61.8 °C)
- Electronegativity
- 2.2
- Atomic radius
- 120 pm
- Ionization energy
- 10.749 eV
- Discovery
- 1900 · Friedrich Ernst Dorn
Common uses
Cancer treatment, earthquake prediction, research
Did you know?
Radioactive noble gas that can accumulate in basements and cause cancer.
Experiment with the elements
Radon doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.