| Property | Value |
|---|---|
| Atoomnummer | 55 |
| Atoomgewicht | 132.90545192 amu |
| Element family | Alkalimetalen |
| Elektronische configuratie | 1s2 |
| Stable and very long lived isotopes | 133Cs: 100% |
| Previous element | Xenon |
| Next element | Barium |
| Dichtheid | 1.873 g/cm3 (STP) |
| Smelten | 28.55 °C |
| Kookpunt | 690 °C |
| Covalente straal | 2.32 Å |
| Van der Waals straal | 3.43 Å |
| Ionstraal | 1.67 Å |
| Metalic radius | 2.65 Å |
| Eerst ionisatiepotentiaal | 3.894 eV |
| Elektronenaffiniteit | 0.472 eV |
| Electronegativity | 0.79 |
| Discovery year | 1860 |
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