| Element | Rubidium | Symbol | Rb |
| Atomic Number | 37 | Molar Mass | 85.47 gmol-1 |
| Electron Configuration | [Kr]5s1 | Normal State | solid metal |
| Density @STP | 1.53 g cm-3 | Melting Point | 39oC |
| Boiling Point | 688oC | Stable Isotopes | 85Rb, 87Rb |
| Atomic Radius | 250 pm | Ionic Radius | 149 (1+) pm |
| Electronegativity (Pauling) | 0.82 | Ionization Energy (1st) | 403 kJ mol-1 |
| Ionization Energy (2nd) | 2632 kJ mol-1 | Ionization Energy (3rd) | 3900 kJ mol-1 |
| Molar Heat Capacity | 31.1 J K-1mol-1 | Standard Molar Entropy | 76.8 J K-1mol-1 |
| Enthalpy of Fusion | 2.2 kJ mol-1 | Enthalpy of Vapourization | 69.2 kJ mol-1 |