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Rubidium (Rb)
Atomic number 37 · alkali
| Atomic number | 37 |
|---|---|
| Atomic mass | 85.4678 u |
| Molar mass | 85.4678 g/mol |
| Category | alkali |
| Group / period / block | 1 / 5 / s |
| Electron configuration | [Kr] 5s |
| Electrons per shell | 2, 8, 18, 8, 1 |
| Electronegativity (Pauling) | 0.82 |
| Atomic radius | 235.0 pm |
| Density | 1.53 g/cm³ |
| First ionisation energy | 4.1771 eV |
| Melting point | 312.45 K (39.30 °C) |
| Boiling point | 961.15 K (688.00 °C) |
| Common oxidation states | +1 |
| Abundance in Earth's crust | 90 ppm |
Uses
Atomic clocks, research
Discovery
1861, R. Bunsen, G. Kirchoff