86 Rn
Noble gas
Radon
Radioactive gas from uranium decay.
Properties of Radon
- Atomic number (Z)
- 86
- Symbol
- Rn
- Atomic mass
- 222 g/mol
- Category
- Noble gas
- Group
- 18
- Period
- 6
- Electron configuration
- [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶
- Electronegativity (Pauling)
- 2.2
- Atomic radius
- 120 pm
- First ionization energy
- 1037 kJ/mol
- Melting point
- 202 K (-71.1 °C)
- Boiling point
- 211.3 K (-61.8 °C)
- Density
- 0.00973 g/cm³
- Phase at 25 °C
- Gas
- Discovered
- Discovered in 1900