Beryllium |
| Symbol | Be |
|---|---|
| Latin name | Beryllium |
| Atomic number | 4 |
| Period | 2 |
| Element category | Alkaline earth metals |
| Relative atomic mass | 9.012182 |
| Group | II.A |
| Electronegativity | 1.5 |
| Oxidation numbers | 2 |
| Electron configuration | 1s2 2s2 |
| Density [g/cm3] | 1.828 |
| State | Solid |
| Melting point [°C] | 1278 |
| Boiling point [°C] | 2970 |
| Atomic radius [pm] | 112 |
| Covalent radius [pm] | 90 |
| Thermal conductivity [W m-1K-1] | 200 |
| Heat capacity [J K-1g-1] | 1.825 |
| Discovery | 1828 |
| Hardness [Mohs scale] | 5.0-5.5 |
| Vickers hardness [MPa] | 1670 |
| Brinell hardness [MPa] | 600 |
| Young's modulus [GPa] | 287 |
| Electrical conductivity [S m-1] | 2.5 · 107 |
| Shear modulus [GPa] | 132 |
| 1.st ionization energy [eV] | 9.3226 |
| 2.nd ionization energy [eV] | 18.211 |
| 3.rd ionization energy [eV] | 153.893 |
| Stable isotopes | 1 |
| Unstable isotopes | 3 |