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(submitted by the website administration)
| Hydrogen | ||||
| Classification: Non-metallic, Symbol: H, Crystal structure: Hexagonal, Electron configuration: 1s1 | ||||
| Property | Value in metric unit | Value in US unit | ||
| Atomic radius | 0.79 | Å | 0.79 | Å |
|---|---|---|---|---|
| Covalent radius | 0.32 | Å | 0.32 | Å |
| Ionic radius | 0.012 | Å | 0.012 | Å |
| Valence electron potential | -1200 | eV | -1200 | eV |
| Energy of first ionization | 1312 | kJ/mol | 313.9 | kcal/mol |
| Electro-chemical equivalent | 0.0376 *10-3 | kg/A*hr | 1.33 *10-3 | oz/A*hr |
| Electro-negativity (Pauling) | 2.2 | 2.2 | ||
| Atomic mass (average) | 1.00794 | 1.00794 | ||
| Atomic volume | 14.4 | cm³/mol | 0.08787 | in³/mol |
| Density of gas at 68°F (20°C), 1 atm. | 0.08988 | kg/m³ | 5.6 *10-3 | lb/ft³ |
| Heat of fusion | 0.05868 | kJ/mol | 0.01404 | kcal/mol |
| Heat of vaporization | 0.44936 | kJ/mol | 0.1075 | kcal/mol |
| Specific heat capacity | 14304 | J/(kg*K) | 3.411 | BTU/(lb*ºF) |
| Boiling point | -252.9 | ºC | -423.2 | ºF |
| Melting Point | -259.1 | ºC | -434.5 | ºF |
| Thermal conductivity at 68°F (20°C), 1 atm. | 0.18 | W/(m*K) | 1.25 | BTU*in/(hr*ft²*ºF) |
| Appearance | colorless, odorless, tasteless gas | |||
