| Property | Value |
|---|---|
| Atomic number | 55 |
| Atomic weight | 132.90545192 amu |
| Element family | Alkali metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 133Cs: 100% |
| Previous element | Xenon |
| Next element | Barium |
| Density | 1.873 g/cm3 (STP) |
| Melting | 28.55 °C |
| Boiling | 690 °C |
| Covalent radius | 2.32 Å |
| Van der Waals radius | 3.43 Å |
| Ionic radius | 1.67 Å |
| Metallic radius | 2.65 Å |
| First ionization potential | 3.894 eV |
| Electron affinity | 0.472 eV |
| Electronegativity | 0.79 |
| Discovery year | 1860 |
Cesium is an element number 55 from alkali metals family. Its symbol is Cs. Cesium atomic weight is 132.90545192 amu. Cs stable and long lived isotopes are 133Cs: 100%. Cesium electronic configuration is 1s22s22p63s23p63d104s24p64d105s25p66s1. Sample compounds that contain Cesium are CsCl, CsI, CsOH, CsBr, Cs2SO4, CsF.
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