Beryllium

Symbol | Be
Latin name | Beryllium
Atomic number | 4
Period | 2
Element category | 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