Atomic number:86

Group numbers:18

Period:6

Electronic configuration:[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶

Formal oxidation number:0

Electronegativities:-

Atomic radius / pm:240

Relative atomic mass:[222]

 

Radon was discovered by Robert Bowie Owens and Ernest Rutherford (GB) in 1899. The origin of the name is variation of the name of element radium; radon was called niton at first, from the Latin word nitens meaning shining. It is a colourless, odourless radioactive, heavy, noble gas that is chemically inert and non-flammable but is highly radiotoxic and carcinogen by inhalation. Radon is formed from the decay of radium in the earths crust. It is used to treat some forms of cancer.

Density / g dm^-3:4400 (liquid, b.p.)

 9.73 (gas, 273 K)

Molar volume / cm³mol^-1:50.45 (liquid, b.p.)

 22816.03 (gas, 273 K)

Electrical resistivity / μΩcm:- (20 °C)

Thermal conductivity / W m^-1K^-1:0.0036

Melting point / °C:-71

Boiling point / °C:-61.7

Heat of fusion / kJ mol^-1:2.7

Heat of vaporization / kJ mol^-1:18.1

Heat of atomization / kJ mol^-1:0

1st ionization energy / kJ mol^-1:1037.08

2nd ionization energy / kJ mol^-1:-

3rd ionization energy / kJ mol^-1:-

in the atmosphere / ppm:-

in the Earth's crust / ppm:-

in the oceans / ppm:9E-15