| Atomic Number: | 37 |
| Element Symbol: | Rb |
| Element Name: | Rubidium |
| Atomic Weight: | 85.4678 |
| Group Number: | 1 |
| Group Name: | Alkali metal |
| Period Number: | 5 |
| Block: | s-block |
| Ground State Configuration: | [Kr] 5s |
| Ground State Level: | 2S1/2 |
| Standard State: | Solid |
| Common Valences: | 0,1 |
| Bond Length: | 495 |
| Atomic Radius Empirical: | 235 |
| Atomic Radius Calculated: | 265 |
| Covalent Radius Empirical: | 211 |
| Electron Affinity: | 46.9 |
| First Ionization Energy: | 403.0 |
| Pauling Electronegativity: | 0.82 |
| Sanderson Electronegativity: | 0.31 |
| Allred Rochow Electronegativity: | 0.89 |
| Mulliken Jaffe Electronegativity: | 0.69 |
| Allen Electronegativity: | 0.706 |
| Density Of Solid: | 1532 |
| Molar Volume: | 55.76 |
| Velocity Of Sound: | 1300 |
| Youngs Modulus: | 2.4 |
| Bulk Modulus: | 2.5 |
| Mineral Hardness: | 0.3 |
| Brinell Hardness: | 0.216 |
| Electrical Resistivity: | 12 |
| Melting Point: | 39.31 |
| Boiling Point: | 688 |
| Critical Temperature: | 1820 |
| Thermal Conductivity: | 58 |
| Enthalpy Of Fusion: | 2.19 |
| Enthalpy Of Vaporization: | 72 |
| Enthalpy Of Atmization: | 81 |
| Most Common Oxidation Numbers: | 1 |
| Color: | Silvery white |
| Classification: | Metallic |
| Discovered By: | Robert Bunsen, Gustav Kirchhoff |
| Discovered At: | Germany |
| Discovered When: | 1861 |
| Origin Of Name: | From the Latin word rubidius meaning dark red or deepest red |
Calculate the molecular weight of Rubidium or molecular weight Rb.
Also see the full list of chemical elements and atomic weights.