• Class: Inert Gases
• Period: 6
• IUPAC group: 18
• Traditional: 0

• Discovered in: 1900 by Dorn
• Origin of name: From Radium
• Historical or alternate name:

Soil to the extent of 1 g per square mile to a depth of 6 inches

Colorless odorless gas. Chemically inert and nonflammable.

• Atmosphere: ~0.0 ppm
• Primitive mantle: ~0.0 ppm
• Sea water: 9e-15 ppm
• Metallic meteorite: ~0.0 ppm
• ConTinental crust: trace ppm
• Solar photosphere: ~0.0 log of abundance
• Oceanic crust: ~0.0 ppm
• Solar system: ~0.0 relative to Si=1.0e6

   Hazards

Highly radiotoxic. Carcinogen by inhalation..

• Lower:
• Upper:

Radon Physical Properties

 Transitional Data

• State: Gas
• Density: 9.73 g/L

 Molar enthalpy

• Atomization: 0.0 kJ mol-1
• Fusion: 2.7 kJ mol-1
• Vaporization: 18.1 kJ mol-1

 Transition points

• MelTing point: 202.0 K
• Boiling point: 211.4 K
• Critical temperature: 377.0 K

 Molar properties

• Atomic weight: 222.0176 g/mole
• Molar volume: cm3 mol-1

 Crystal structure sequence

 Thermodynamics

• State: gas
  • Enthalpy 0
  • Gibbs function 0
  • Entropy 176.21
  • Heat Capacity 20.786

 Miscellaneous physical

• Electrical resistivity: µ-ohms/cm
• Debye temperature: K
• Thermal conductivity: 0.0036 W / m / K
• Coefficient of linear expansion: Coef. per K
• Mass magnetic susceptibility:
• X-ray diffraction mass absorption coefficients:
• CuK: (µ/p)/cm2 g-1
• MoK: (µ/p)/cm2 g-1

Radon Chemical Properties

 Chemical basics:

• Oxidation states: 0
• Molecular wt: 222.0176 g/mole

 Radii

• Covalent: pm
• Atomic: 240.0 pm
• Van der Waals: pm

 Ions:

 Covalent bonds

 Effective nuclear charge

• Slater: 8.25
• Clementi: 16.08
• Froese-Fischer: 20.84

 Electronegativity

• Pauling:
• Allred-Rochow:

 Standard reactions

Radon Nuclear Properties

• Known 20
• Listed 0

• Known 204 - 224
• Listed

• Isotope 222Cross-section 0.72±0.07 barns

Radon Energy Properties

Electrons

• Ground state electron configuration: [Xe] 4f14 5d10 6s2 6p6
• Electron affinity: -41 kJ mol-1
• Filling orbitals:

 Ionization energies

 Atomic energy levels