Beryllium
Alkaline earth metal| Atomic number | 4 |
|---|---|
| Category | Alkaline earth metal |
| Atomic mass | 9.012 |
| Electron configuration | [He]2s² |
| Oxidation states | +2 |
| Electronegativity | 1.57 |
| Melting point | 1,287 °C |
| Boiling point | 2,469 °C |
| Density | 1.85 g/cm³ |
| Crystal structure | Close-packed hexagonal |
| Group | 2 |
| Period | 2 |
| Block | s |
| Discovered | 1,798 |
| Crustal abundance | 2.8 ppm |