| Element | Barium | Symbol | Ba |
| Atomic Number | 56 | Molar Mass | 137.34 gmol-1 |
| Electron Configuration | [Xe]6s2 | Normal State | solid metal |
| Density @STP | 3.59 g cm-3 | Melting Point | 727oC |
| Boiling Point | 1897oC | Stable Isotopes | 130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba |
| Atomic Radius | 224 pm | Ionic Radius | 136 (2+) pm |
| Electronegativity (Pauling) | 0.89 | Ionization Energy (1st) | 503 kJ mol-1 |
| Ionization Energy (2nd) | 965 kJ mol-1 | Ionization Energy (3rd) | 3600 kJ mol-1 |
| Molar Heat Capacity | 28.1 J K-1mol-1 | Standard Molar Entropy | 62.5 J K-1mol-1 |
| Enthalpy of Fusion | 7.66 kJ mol-1 | Enthalpy of Vapourization | 150.9 kJ mol-1 |