Cs
Cesium
Element 55 · Alkali metal · Period 6, Group 1
Solid · Discovered 1860
Atomic Properties
| Atomic Number | 55 |
| Atomic Mass | 132.905452u |
| Electron Configuration | [Xe]6s1 |
| Electronegativity | 0.79Pauling |
| Atomic Radius | 343pm |
| Ionization Energy | 3.894eV |
| Electron Affinity | 0.472eV |
| Oxidation States | +1 |
Physical Properties
| Standard State | Solid |
| Melting Point | 301.59K |
| Boiling Point | 944K |
| Density | 1.93g/cm³ |
| Group Block | Alkali metal |
| Year Discovered | 1860 |