| Attribute | Value |
|---|---|
| Symbol | Cs |
| Standard state | Solid |
| Atomic mass | 132.905452 u |
| Electron configuration | [Xe]6s¹ |
| Oxidation states |
|
| Electronegativity (pauling scale) | 0.79 |
| Atomic radius (van der waals) | 343 pm |
| Ionization energy | 3.894 eV |
| Electron affinity | 0.472 eV |
| Melting point | 301.59 K |
| Boiling point | 944 K |
| Density | 1.93 g/cm³ |
| Atomic number | 55 |
| Group name | Alkali metal |
| Discovered | 1860 year |