| Element (Atom) Name | Rubidium |
| Symbol | Ru |
| Physical state at room temperature | Solid |
| Element Classification | Metal |
| Group Name | Alkali Metal |
| Group number (Periodic table) | 1 |
| Period Number (Periodic table) | 5 |
| Atomic number | 37 |
| Atomic Weight | 85.468 (Ref: science.co.il) 85.4678 (Ref: Jlab-ele037, Ciaaw-rubidium) 85.47 (Ref: Lanl-37) |
| Atomic Radius | 303 pm (Van der Waals) (Ref: Lanl-37) |
| Density | 1.53 g/cm3 (Ref: Jlab-ele037) |
| Melting point | 39.31°C (Ref: Jlab-ele037) 39.3 °C (Ref: Lanl-37) |
| Boiling point | 688°C (Ref: Jlab-ele037, Lanl-37) |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s1 |
| Oxidation States | +1 (Ref: Jlab-ele037) +1, −1 (a strongly basic oxide) (Ref: Lanl-37) |
| Ionization Energy | 4.177 eV (Ref: Jlab-ele037) |
| Number of Stable Isotopes | 1 |
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