Fermium vs Darmstadtium
| Property | Fm Fermium | Ds Darmstadtium |
|---|---|---|
| Atomic number | 100 | 110 |
| Symbol | Fm | Ds |
| Name | Fermium | Darmstadtium |
| Category | actinide | transition-metal |
| Standard Atomic Weight | 257 u | 281 u |
| Period | 7 | 7 |
| Group | N/A | 10 |
| Block | s | s |
| Phase at STP | solid | N/A |
| Electron configuration | [Rn] 5f12 7s2 | [Rn]7s25f146d8(predicted) |
| Oxidation states | [2, 3] | [0, 2, 4, 6, 8] |
| Electronegativity (Pauling) | 1.3 | N/A |
| Electron affinity | 0.339 eV | 1.6 eV |
| Density | 9700 kg/m³ | 3.480000e+4 kg/m³ |
| Melting point | 1526.85 °C | -273.15 °C |
| Boiling point | -273.15 °C | -273.15 °C |
| Discovery year | 1952 | 1994 |