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.