| Element | Fermium | Symbol | Fm |
| Atomic Number | 100 | Molar Mass | 257.1 g mol-1 |
| Electron Configuration | [Rn]5f127s2 | Normal State | solid metal |
| Density @STP | g cm-3 | Melting Point | 1527oC |
| Boiling Point | oC | Stable Isotopes | none |
| Atomic Radius | Ionic Radius | 91 (3+) pm | |
| Electronegativity (Pauling) | 1.3 | Ionization Energy (1st) | 627 kJ mol-1 |
| Ionization Energy (2nd) | 1225 kJ mol-1 | Ionization Energy (3rd) | 2354 kJ mol-1 |
| Molar Heat Capacity | J K-1mol-1 | Standard Molar Entropy | J K-1mol-1 |
| Enthalpy of Fusion | kJ mol-1 | Enthalpy of Vapourization | kJ mol-1 |