86 Rn

Noble gas

Radon

Radioactive gas from uranium decay.

See it in the interactive periodic table

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
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