Praseodymium vs Francium
| Property | Pr Praseodymium | Fr Francium |
|---|---|---|
| Atomic number | 59 | 87 |
| Symbol | Pr | Fr |
| Name | Praseodymium | Francium |
| Category | lanthanide | alkali-metal |
| Standard Atomic Weight | 140.90766 u | 223 u |
| Period | 6 | 7 |
| Group | N/A | 1 |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f3 | [Rn]7s1 |
| Oxidation states | [0, 1, 2, 3, 4, 5] | [1] |
| Electronegativity (Pauling) | 1.13 | 0.7 |
| Electron affinity | 0.962 eV | 0.491 eV |
| Density | 6770 kg/m³ | 1870 kg/m³ |
| Melting point | 930.85 °C | 26.85 °C |
| Boiling point | 3519.85 °C | -273.15 °C |
| Discovery year | 1885 | 1939 |