Cesium is a soft, silvery-white alkali metal from the periodic table. It is highly reactive and readily forms compounds with other elements. Cesium is used in atomic clocks and in spectroscopy, as well as in the production of photoelectric cells and vacuum tubes.
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| Atomic number | 55 |
| Group | IA |
| Period | 6 |
| Mass | 132.90546 |
| Latin name | Caesium |
| Electron configuration | [Xe]6s |
| Oxidation state | -1, 0, 1 |