55
Cs
Caesium
132.9054519 | 2
8
18
18
8
1
|
55
Cs
Caesium
132.9054519 | 2
8
18
18
8
1
|
| General |
|---|
| Name | Caesium | | Symbol | Cs | | Number | 55 | | Chemical series | Alkali metals | | Group / Period | 1 / 6 | | Block | s-block | | CAS registry number | 7440-46-2 |
| Physical properties |
|---|
| State | solid | | Density | 1.93 g/cm3 | | Melting point | 301.59 K (28.44°C, 83.19°F) | | Boiling point | 944 K (671 °C, 1240 °F) | | Critical point | 1938 K, 9.4 MPa |
| Atomic properties |
|---|
| Atomic Weight | 132.9054519 g/mol | | Crystal structure | cubic body centered | | Electronegativity | 0.79 | | Atomic radius | 260 pm | | Atomic radius (calculated) | 298 pm | | Electron configuration | [Xe] 6s1 | | Electrons per shell | 2, 8, 18, 18, 8, 1 | | Number of protons | 55 | | Number of neutrons | 78 |
|
Barium