56
Ba
Barium
137.327 | 2
8
18
18
8
2
|
56
Ba
Barium
137.327 | 2
8
18
18
8
2
|
| General |
|---|
| Name | Barium | | Symbol | Ba | | Number | 56 | | Chemical series | Alkaline earth metals | | Group / Period | 2 / 6 | | Block | s-block | | CAS registry number | 7440-39-3 |
| Physical properties |
|---|
| State | solid | | Density | 3.51 g/cm3 | | Melting point | 1000 K (727°C, 1341°F) | | Boiling point | 2170 K (1897 °C, 3447 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | 137.327 g/mol | | Crystal structure | cubic body centered | | Electronegativity | 0.89 | | Atomic radius | 215 pm | | Atomic radius (calculated) | 253 pm | | Electron configuration | [Xe] 6s2 | | Electrons per shell | 2, 8, 18, 18, 8, 2 | | Number of protons | 56 | | Number of neutrons | 82 |
|
Lanthanum