| Property | Value |
|---|---|
| Atomic number | 56 |
| Atomic weight | 137.3277 amu |
| Element family | Alkali earth metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 130Ba: 0.106%, 132Ba: 0.101%, 134Ba: 2.417%, 135Ba: 6.592%, 136Ba: 7.854%, 137Ba: 11.23%, 138Ba: 71.70% |
| Previous element | Cesium |
| Next element | Lanthanum |
| Density | 3.594 g/cm3 (STP) |
| Melting | 729 °C |
| Boiling | 1640 °C |
| Covalent radius | 1.96 Å |
| Van der Waals radius | 2.68 Å |
| Ionic radius | 1.35 Å |
| Metallic radius | 2.22 Å |
| First ionization potential | 5.212 eV |
| Electron affinity | 0.145 eV |
| Electronegativity | 0.89 |
| Discovery year | 1772 |
Barium is an element number 56 from alkali earth metals family. Its symbol is Ba. Barium atomic weight is 137.3277 amu. Ba stable and long lived isotopes are 130Ba: 0.106%, 132Ba: 0.101%, 134Ba: 2.417%, 135Ba: 6.592%, 136Ba: 7.854%, 137Ba: 11.23%, 138Ba: 71.70%. Barium electronic configuration is 1s22s22p63s23p63d104s24p64d105s25p66s2. Sample compounds that contain Barium are BaCl2, Ba(OH)2, BaSO4, Ba(NO3)2, BaCO3, Ba3(PO4)2.
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