| Property | Value |
|---|---|
| Atoomnummer | 37 |
| Atoomgewicht | 85.46783 amu |
| Element family | Alkalimetalen |
| Elektronische configuratie | 1s2 |
| Stable and very long lived isotopes | 85Rb: 72.17% |
| Previous element | Krypton |
| Next element | Strontium |
| Dichtheid | 1.532 g/cm3 (STP) |
| Smelten | 39.64 °C |
| Kookpunt | 688 °C |
| Covalente straal | 2.1 Å |
| Van der Waals straal | 3.03 Å |
| Ionstraal | 1.52 Å |
| Metalic radius | 2.48 Å |
| Eerst ionisatiepotentiaal | 4.177 eV |
| Elektronenaffiniteit | 0.486 eV |
| Electronegativity | 0.82 |
| Discovery year | 1861 |
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