Cesium vs Francium
Pick up to 3 elements and see how they stack up.
| Property | Cesium | Francium |
|---|---|---|
| Atomic number | 55 | 87 |
| Atomic mass | 132.91 | 223 |
| Electronegativity | 0.79 | 0.79 |
| Melting point | 301.59 K (28.4 °C) | 300 K (26.9 °C) |
| Boiling point | 944 K (670.8 °C) | 950 K (676.8 °C) |
| Density | 1.93 g/cm³ | 1.87 g/cm³ |
| Atomic radius | 343 pm | 348 pm |
| Ionization energy | 3.894 eV | 3.9 eV |
| Discovered | 1860 | 1939 |
| Category | Alkali metal | Alkali metal |
| State at room temp. | Solid | Solid |
| Block | s | s |
| Group | 1 | 1 |
| Period | 6 | 7 |
| Valence electrons | 1 | 1 |
| Common charges | +1 | +1 |
| Electron configuration | [Xe] 6s1 | [Rn] 7s1 |