Mercury vs Neptunium
| Property | Hg Mercury | Np Neptunium |
|---|---|---|
| Atomic number | 80 | 93 |
| Symbol | Hg | Np |
| Name | Mercury | Neptunium |
| Category | transition-metal | actinide |
| Standard Atomic Weight | 200.592 u | 237 u |
| Period | 6 | 7 |
| Group | 12 | N/A |
| Block | s | s |
| Phase at STP | liquid | solid |
| Electron configuration | [Xe]6s24f145d10 | [Rn]7s25f46d1 |
| Oxidation states | [-2, 1, 2] | [2, 3, 4, 5, 6, 7] |
| Electronegativity (Pauling) | 2 | 1.36 |
| Electron affinity | -0.5 eV | 0.48 eV |
| Density | 1.353360e+4 kg/m³ | 2.025000e+4 kg/m³ |
| Melting point | -38.83 °C | 643.85 °C |
| Boiling point | 356.73 °C | 3901.85 °C |
| Discovery year | N/A | 1940 |