Lanthanum vs Francium
| Property | La Lanthanum | Fr Francium |
|---|---|---|
| Atomic number | 57 | 87 |
| Symbol | La | Fr |
| Name | Lanthanum | Francium |
| Category | lanthanide | alkali-metal |
| Standard Atomic Weight | 138.90547 u | 223 u |
| Period | 6 | 7 |
| Group | N/A | 1 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s25d1 | [Rn]7s1 |
| Oxidation states | [0, 1, 2, 3] | [1] |
| Electronegativity (Pauling) | 1.1 | 0.7 |
| Electron affinity | 0.47 eV | 0.491 eV |
| Density | 6150 kg/m³ | 1870 kg/m³ |
| Melting point | 917.85 °C | 26.85 °C |
| Boiling point | 3463.85 °C | -273.15 °C |
| Discovery year | 1839 | 1939 |