Rubidium
Alkali metal| Atomic number | 37 |
|---|---|
| Category | Alkali metal |
| Atomic mass | 85.468 |
| Electron configuration | [Kr]5s¹ |
| Oxidation states | +1 |
| Electronegativity | 0.82 |
| Melting point | 39.3 °C |
| Boiling point | 688 °C |
| Density | 1.532 g/cm³ |
| Crystal structure | Body-centred cubic |
| Group | 1 |
| Period | 5 |
| Block | s |
| Discovered | 1,861 |
| Crustal abundance | 90 ppm |