|
|
| Argon | |
| Electron Configuration | 2,8,8 |
| Electron Configuration | [Ne] 3s2 3p6 |
| Ground state | 1S0 |
| Atomic Volume | 28.5 g/cm3 |
| 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 | No data. |
| 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)  |
|
| 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° | |