86RnRadon222[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶
noble gas
Radon
Radon is a chemical element with symbol Rn and atomic number 86. It is a radioactive, colorless, odorless, tasteless noble gas, occurring naturally as a decay product of radium. Its most stable isotope, 222Rn, has a half-life of 3.8 days.
A stylized shell model. Electrons are quantum objects, not particles following these literal paths. Sizes and motion are illustrative.
Electrons by shell
Electron configuration
4f14
5d10
6s2
6p6
54 is the [Xe] core total across five shells.
At a glance
- Atomic number
- 86
- Atomic mass
- 222 u
- Phase
- Gas
- Density
- 9.73 g/L
- Melting point
- 202 K
- Boiling point
- 211.5 K
- First ionization energy
- 1,037 kJ/mol
- Electronegativity
- 2.2
- Electron affinity
- -68 kJ/mol
- Molar heat capacity
- Unavailable
- Period
- 6
- Appearance
- colorless gas, occasionally glows green or red in discharge tubes
Conditions and isotopes affect measured properties. Some properties of short-lived elements are predicted. Electronegativity uses the Pauling scale.
Keep exploring
Explore the stories, imagery, and reference data in more depth. Properties with no value in the reference are marked unavailable.