Radon vs Francium
Pick up to 3 elements and see how they stack up.
| Property | Radon | Francium |
|---|---|---|
| Atomic number | 86 | 87 |
| Atomic mass | 222 | 223 |
| Electronegativity | 2.2 | 0.79 |
| Melting point | 202 K (-71.1 °C) | 300 K (26.9 °C) |
| Boiling point | 211.3 K (-61.8 °C) | 950 K (676.8 °C) |
| Density | 9.73 g/L | 1.87 g/cm³ |
| Atomic radius | 220 pm | 348 pm |
| Ionization energy | 10.745 eV | 3.9 eV |
| Discovered | 1899 | 1939 |
| Category | Noble gas | Alkali metal |
| State at room temp. | Gas | Solid |
| Block | p | s |
| Group | 18 | 1 |
| Period | 6 | 7 |
| Valence electrons | 8 | 1 |
| Common charges | 0 | +1 |
| Electron configuration | [Xe] 4f14 5d10 6s2 6p6 | [Rn] 7s1 |