Rubidium is a chemical element from the periodic table. It is a soft, silvery-white metallic element that is highly reactive. Rubidium is primarily used in photocells and in the production of vacuum tubes and cathode ray tubes. It is also used in the manufacture of glass and in atomic clocks.
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| Atomic number | 37 |
| Group | IA |
| Period | 5 |
| Mass | 85.4678 |
| Latin name | Rubidium |
| Electron configuration | [Kr]5s |
| Oxidation state | -1, 0, 1 |