86Gas
Rn 222 Atomic mass · uNoble gases
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.
Discovery 1900 (Friedrich Ernst Dorn)
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Physical properties
Values for the element in its standard state.
- Density
- 0.00973g/cm³
- Melting point
- 202K
- Boiling point
- 211K
- Atomic radius
- 145pm
- Bonding type
- Atomic
- Molar heat
- Not available
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 6 electrons;
[Xe] represents 54 core electrons. The full view shows them explicitly.
86 electrons Orbital order preserved from source
- Electronegativity
- Not availablePauling scale
- First ionization energy
- 1,037kJ/mol
- Electron affinity
- 0kJ/mol
- Van der Waals radius
- Not available
Rn RadonAtomic number 86
1,037kJ/mol
Atomic numberGaps indicate unavailable data
About radon
- Appearance
- Colorless gas, occasionally glows green or red in discharge tubes
- Discovery
- 1900 (Friedrich Ernst Dorn)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.