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Beryllium (Be)
Atomic number 4 · alkaline
| Atomic number | 4 |
|---|---|
| Atomic mass | 9.01218 u |
| Molar mass | 9.01218 g/mol |
| Category | alkaline |
| Group / period / block | 2 / 2 / s |
| Electron configuration | [He] 2s2 |
| Electrons per shell | 2, 2 |
| Electronegativity (Pauling) | 1.57 |
| Atomic radius | 105.0 pm |
| Density | 1.85 g/cm³ |
| First ionisation energy | 9.3227 eV |
| Melting point | 1560.15 K (1287.00 °C) |
| Boiling point | 2741.15 K (2468.00 °C) |
| Common oxidation states | +2 |
| Abundance in Earth's crust | 2.8 ppm |
Uses
Light aerospace alloys, X-ray windows
Discovery
1798, Fredrich Wöhler, A.A.Bussy