Caesium
Alkali metal| Atomic number | 55 |
|---|---|
| Category | Alkali metal |
| Atomic mass | 132.91 |
| Electron configuration | [Xe]6s¹ |
| Oxidation states | +1 |
| Electronegativity | 0.79 |
| Melting point | 28.4 °C |
| Boiling point | 671 °C |
| Density | 1.93 g/cm³ |
| Crystal structure | Body-centred cubic |
| Group | 1 |
| Period | 6 |
| Block | s |
| Discovered | 1,860 |
| Crustal abundance | 3 ppm |