Lead vs Francium
| Property | Pb Lead | Fr Francium |
|---|---|---|
| Atomic number | 82 | 87 |
| Symbol | Pb | Fr |
| Name | Lead | Francium |
| Category | post-transition-metal | alkali-metal |
| Standard Atomic Weight | 207.2 u | 223 u |
| Period | 6 | 7 |
| Group | 14 | 1 |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f145d106p2 | [Rn]7s1 |
| Oxidation states | [-4, -2, -1, 0, 1, 2, 3, 4] | [1] |
| Electronegativity (Pauling) | 2.33 | 0.7 |
| Electron affinity | 0.364 eV | 0.491 eV |
| Density | 1.134200e+4 kg/m³ | 1870 kg/m³ |
| Melting point | 327.46 °C | 26.85 °C |
| Boiling point | 1748.85 °C | -273.15 °C |
| Discovery year | 2021 | 1939 |