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 |