Properties | More Info | Isotopes | Spectra
Compounds | Reactions | Production
Atomic: M.A.C. | Reference
Diagrams: Shell | Atomic Radius | Electron || Images
Argon
Electrons per shell 2,8,8
Electron Configuration [Ne] 3s2 3p6 open electron config
Ground state 1S0
Atomic Volume 28.5 cm3 mol-1
Electronegativity No data.
Magnetic ordering No data
Mass magnetic susceptibility -6 x 10-9
Molar magnetic susceptibility -2.4 x 10-10
Speed of sound 323 m s-1
Thermal Properties
Enthalpy of Atomization No data.
Enthalpy of Fusion 1.21 kJ mol-1
Enthalpy of Vaporisation 6.53 kJ mol-1
Heat Capacity 20.786 J mol-1 K-1
Thermal Conductivity 17.72 W m-1 K-1
Thermal Expansion No data.
Electrical Properties
Electrical resistivity No data.
Electrical conductivity ? 106/cm Ω
Chemical Properties
Ionization Potential  
First 15.759
Second 27.629
Third 40.74
Optical Properties
Refractive Index (gas) 1.000281
Energy Levels
Kα1 (intensity 100) 2.9577 KeV
Kα2 (intensity 0) 2.95563 KeV
Kβ1 (intensity 11.3) 3.1905 KeV
Lα1 (intensity 100) 0.2205 KeV
Lγ3 (intensity 0) 0.218 KeV
Ll (intensity 100) 0.2205 KeV
Atomic Radii
Empirical 71 pm
Bohr Radius 71 pm
Covalent Radius 97 pm
Van der Waals 188 pm
Triple covalent 96 pm
Metallic No data.
Oxidation States
Main Ar0
Other
Ionisation Energies (kJ mol-1) show graph
M - M+ 1520.4
M+ - M2+ 2665.2
M2+ - M3+ 3928
M3+ - M4+ 5770
M4+ - M5+ 7238
M5+ - M6+ 8811
M6+ - M7+ 12021
M7+ - M8+ 13844
M8+ - M9+ 40759
M9+ - M10+ 46186
Vapour Pressure
P (Pa) 1 10 100 1K 10K 100K
T (K) 47 53 61 71 87
Crystal Structure
Structure Cubic Close packed
a = 525.6 pm
b = 525.6 pm
c = 525.6 pm
α = 90°
β = 90°
γ = 90°