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| Argon | ||||
| Classification: Non-metal, Group: Noble gases, Symbol: Ar, Crystal structure: Cubic, Electron configuration: 1s2 2s2p6 3s2p6 | ||||
| Property | Value in metric unit | Value in US unit | ||
| Atomic radius | 0.88 | Å | 0.88 | Å |
|---|---|---|---|---|
| Covalent radius | 0.98 | Å | 0.98 | Å |
| Energy of first ionization | 1521 | kJ/mol | 363.8 | kcal/mol |
| Energy of second ionization | 2666 | kJ/mol | 637.8 | kcal/mol |
| Energy of third ionization | 3931 | kJ/mol | 940.4 | kcal/mol |
| Electro-negativity (Allrod Rochow) | 3.2 | 3.2 | ||
| Atomic mass (average) | 39.948 | 39.948 | ||
| Atomic volume | 28.5 | cm³/mol | 1.739 | in³/mol |
| Density of gas at 68°F (20°C), 1 atm. | 1.7824 | kg/m³ | 0.1113 | lb/ft³ |
| Heat of fusion | 1.188 | kJ/mol | 0.2842 | kcal/mol |
| Heat of vaporization | 6.447 | kJ/mol | 1.5423 | kcal/mol |
| Specific heat capacity | 520 | J/(kg*K) | 0.124 | BTU/(lb*ºF) |
| Boiling point | -185.9 | ºC | -302.5 | ºF |
| Melting Point | -189.4 | ºC | -308.8 | ºF |
| Thermal conductivity at 68°F (20°C), 1 atm. | 0.02 | W/(m*K) | 0.14 | BTU*in/(hr*ft²*ºF) |
| Appearance | colorless, odorless, tasteless gas | |||
