Barium |
| Symbol | Ba |
|---|---|
| Latin name | Baryum |
| Atomic number | 56 |
| Period | 6 |
| Element category | Alkaline earth metals |
| Relative atomic mass | 137.327 |
| Group | II.A |
| Electronegativity | 0.9 |
| Oxidation numbers | 2 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 6s2 |
| Density [g/cm3] | 3.5 |
| State | Solid |
| Melting point [°C] | 725 |
| Boiling point [°C] | 1640 |
| Thermal conductivity [W m-1K-1] | 18.4 |
| Heat capacity [J K-1g-1] | 0.204 |
| Discovery | 1808 |
| Hardness [Mohs scale] | 1.25 |
| Young's modulus [GPa] | 13 |
| Electrical conductivity [S m-1] | 2.8 · 106 |
| Shear modulus [GPa] | 4.9 |
| 1.st ionization energy [eV] | 5.2117 |
| 2.nd ionization energy [eV] | 10.004 |
| Stable isotopes | 7 |
| Unstable isotopes | 17 |