| Property | Value |
|---|---|
| Atomic number | 37 |
| Atomic weight | 85.46783 amu |
| Element family | Alkali metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 85Rb: 72.17% |
| Previous element | Krypton |
| Next element | Strontium |
| Density | 1.532 g/cm3 (STP) |
| Melting | 39.64 °C |
| Boiling | 688 °C |
| Covalent radius | 2.1 Å |
| Van der Waals radius | 3.03 Å |
| Ionic radius | 1.52 Å |
| Metallic radius | 2.48 Å |
| First ionization potential | 4.177 eV |
| Electron affinity | 0.486 eV |
| Electronegativity | 0.82 |
| Discovery year | 1861 |
Rubidium is an element number 37 from alkali metals family. Its symbol is Rb. Rubidium atomic weight is 85.46783 amu. Rb stable and long lived isotopes are 85Rb: 72.17%. Rubidium electronic configuration is 1s22s22p63s23p63d104s24p65s1. Sample compounds that contain Rubidium are Rb2CO3, Rb2SO4, RbCl, RbI, Rb2Cr2O7, RbOH.
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