Lead vs Protactinium
| Property | Pb Lead | Pa Protactinium |
|---|---|---|
| Atomic number | 82 | 91 |
| Symbol | Pb | Pa |
| Name | Lead | Protactinium |
| Category | post-transition-metal | actinide |
| Standard Atomic Weight | 207.2 u | 231.03588 u |
| Period | 6 | 7 |
| Group | 14 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d106p2 | [Rn]7s25f26d1 |
| Oxidation states | [-4, -2, -1, 0, 1, 2, 3, 4] | [2, 3, 4, 5] |
| Electronegativity (Pauling) | 2.33 | 1.5 |
| Electron affinity | 0.364 eV | 0.123 eV |
| Density | 1.134200e+4 kg/m³ | 1.537000e+4 kg/m³ |
| Melting point | 327.46 °C | 1571.85 °C |
| Boiling point | 1748.85 °C | -273.15 °C |
| Discovery year | 2021 | 1913 |