Promethium vs Nihonium
| Property | Pm Promethium | Nh Nihonium |
|---|---|---|
| Atomic number | 61 | 113 |
| Symbol | Pm | Nh |
| Name | Promethium | Nihonium |
| Category | lanthanide | post-transition-metal |
| Standard Atomic Weight | 145 u | 286 u |
| Period | 6 | 7 |
| Group | N/A | 13 |
| Block | s | p |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s24f5 | [Rn] 5f14 6d10 7s2 7p1(predicted) |
| Oxidation states | [2, 3] | N/A |
| Electronegativity (Pauling) | N/A | N/A |
| Electron affinity | 0.129 eV | 0.6 eV |
| Density | 7260 kg/m³ | 1.600000e+4 kg/m³ |
| Melting point | 1041.85 °C | 426.85 °C |
| Boiling point | 2999.85 °C | 1156.85 °C |
| Discovery year | 1902 | 2004 |