Praseodymium vs Polonium
| Property | Pr Praseodymium | Po Polonium |
|---|---|---|
| Atomic number | 59 | 84 |
| Symbol | Pr | Po |
| Name | Praseodymium | Polonium |
| Category | lanthanide | metalloid |
| Standard Atomic Weight | 140.90766 u | 209 u |
| Period | 6 | 6 |
| Group | N/A | 16 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f3 | [Xe]6s24f145d106p4 |
| Oxidation states | [0, 1, 2, 3, 4, 5] | [-2, 2, 4, 5, 6] |
| Electronegativity (Pauling) | 1.13 | 2 |
| Electron affinity | 0.962 eV | 1.9 eV |
| Density | 6770 kg/m³ | 9320 kg/m³ |
| Melting point | 930.85 °C | 253.85 °C |
| Boiling point | 3519.85 °C | 961.85 °C |
| Discovery year | 1885 | 1898 |