Mercury vs Francium
| Property | Hg Mercury | Fr Francium |
|---|---|---|
| Atomic number | 80 | 87 |
| Symbol | Hg | Fr |
| Name | Mercury | Francium |
| Category | transition-metal | alkali-metal |
| Standard Atomic Weight | 200.592 u | 223 u |
| Period | 6 | 7 |
| Group | 12 | 1 |
| Block | s | s |
| Phase at STP | liquid | solid |
| Electron configuration | [Xe]6s24f145d10 | [Rn]7s1 |
| Oxidation states | [-2, 1, 2] | [1] |
| Electronegativity (Pauling) | 2 | 0.7 |
| Electron affinity | -0.5 eV | 0.491 eV |
| Density | 1.353360e+4 kg/m³ | 1870 kg/m³ |
| Melting point | -38.83 °C | 26.85 °C |
| Boiling point | 356.73 °C | -273.15 °C |
| Discovery year | N/A | 1939 |