SymbolRn
Latin nameRadon
Atomic number86
Period6
Element categoryNoble gases
Relative atomic mass222.0176
GroupVIII.A
Oxidation numbers
2
Electron configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6
Density [g/cm3]
0.00919
State
Gas
Melting point [°C]
-71
Boiling point [°C]
-61.8
Critical point [°C]
104
Critical pressure [MPa]
6.28
Atomic radius [pm]
120
Covalent radius [pm]
145
Thermal conductivity [W m-1K-1]
0.00364
Heat capacity [J K-1g-1]
0.094
Discovery
1900
1.st ionization energy [eV]
10.7485
Stable isotopes
0
Unstable isotopes
20