NO. 086Noble Gas

Rn

Radon

Radon is a radioactive noble gas formed from uranium decay. It poses significant health risks when accumulated indoors and is a leading cause of lung cancer after smoking.

Crystal Structure

Face-centered cubic

Technical Specifications

Atomic Mass222 u

Density0.00973 g/cm³

Melting Point202 K

Boiling Point211 K

Atomic Radius120 pm

Electronegativity2.2

Ionization Energy1037 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeCovalent

Oxidation States0, 2

Acid/BaseNeutral

ReactivityLow

Electron Configuration

[Xe] 4f14 5d10 6s2 6p6

Discovered ByFriedrich Ernst Dorn

Year1900

Known Isotopes

Rn-222