| Hydrogen ✕ | |
|---|---|
| Symbol | H |
| Atomic number | 1 |
| Chemical property | Reactive nonmetal |
| Origin o the name | composed of the Greek elements hydro- and -gen meaning 'water-forming' |
| Group | 1 |
| Period | 1 |
| Atomic weight (u) | 1.008 |
| Atomic weight uncertainty (u) | 0 |
| Density (g/cm³) | 0.00009 |
| Melting point (K) | 14.01 |
| Boiling point (K) | 20.28 |
| Heat capacity (J/(g·K)) | 14.304 |
| Electro-negativity | 2.2 |
| Abundance in earth's crust (mg/kg) | 1400 |