Francium vs Radium
Pick up to 3 elements and see how they stack up.
| Property | Francium | Radium |
|---|---|---|
| Atomic number | 87 | 88 |
| Atomic mass | 223 | 226 |
| Electronegativity | 0.79 | 0.9 |
| Melting point | 300 K (26.9 °C) | 973 K (699.8 °C) |
| Boiling point | 950 K (676.8 °C) | 2,010 K (1,736.8 °C) |
| Density | 1.87 g/cm³ | 5.5 g/cm³ |
| Atomic radius | 348 pm | 283 pm |
| Ionization energy | 3.9 eV | 5.279 eV |
| Discovered | 1939 | 1898 |
| Category | Alkali metal | Alkaline earth metal |
| State at room temp. | Solid | Solid |
| Block | s | s |
| Group | 1 | 2 |
| Period | 7 | 7 |
| Valence electrons | 1 | 2 |
| Common charges | +1 | +2 |
| Electron configuration | [Rn] 7s1 | [Rn] 7s2 |