Atomic Properties
- Atomic Number
- 56
- Atomic Mass
- 137.3300 u
- Electron Configuration
- [Xe] 6s2
- Electronegativity
- 0.89
- Block
- s-block
- Group
- 2
- Period
- 6
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 1000.00 K
- Boiling Point
- 2118.00 K
- Density
- 3.5100 g/cm³
About Barium
Produces green color in fireworks; barium sulfate used in medical imaging.
Isotopes of Barium
Barium has 7 naturally occurring isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 130Ba | 130 | 129.9063207 | 0.1060% | Stable |
| 132Ba | 132 | 131.9050611 | 0.1010% | Stable |
| 134Ba | 134 | 133.9045082 | 2.417% | Stable |
| 135Ba | 135 | 134.9056884 | 6.592% | Stable |
| 136Ba | 136 | 135.9045757 | 7.854% | Stable |
| 137Ba | 137 | 136.9058271 | 11.23% | Stable |
| 138Ba | 138 | 137.905247 | 71.70% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)