Rb
Rubidium
Element 37 · Alkali metal · Period 5, Group 1
Solid · Discovered 1861
Atomic Properties
| Atomic Number | 37 |
| Atomic Mass | 85.468u |
| Electron Configuration | [Kr]5s1 |
| Electronegativity | 0.82Pauling |
| Atomic Radius | 303pm |
| Ionization Energy | 4.177eV |
| Electron Affinity | 0.468eV |
| Oxidation States | +1 |
Physical Properties
| Standard State | Solid |
| Melting Point | 312.46K |
| Boiling Point | 961K |
| Density | 1.53g/cm³ |
| Group Block | Alkali metal |
| Year Discovered | 1861 |