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Hydrogen (H)
Atomic number 1 · Non-metal
| Atomic number | 1 |
|---|---|
| Atomic mass | 1.008 u |
| Molar mass | 1.008 g/mol |
| Category | Non-metal |
| Group / period / block | 1 / 1 / s |
| Electron configuration | 1s |
| Electrons per shell | 1 |
| Electronegativity (Pauling) | 2.2 |
| Atomic radius | 25.0 pm |
| Density | 8e-05 g/cm³ |
| First ionisation energy | 13.5984 eV |
| Melting point | 13.99 K (-259.16 °C) |
| Boiling point | 20.27 K (-252.88 °C) |
| Common oxidation states | -1, +1 |
| Abundance in Earth's crust | 1400 ppm |
Uses
Fuel cells, ammonia for fertilisers, rocket fuel
Discovery
1766, Henry Cavendish