| Property | Value |
|---|---|
| Atomic number | 100 |
| Atomic weight | 257.0951 amu |
| Element family | Actinoids |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | None |
| Previous element | Einsteinium |
| Next element | Mendelevium |
| Density | 9.7 g/cm3 (STP) |
| Melting | 1527 °C |
| First ionization potential | 6.498 eV |
| Electron affinity | 0.350 eV |
| Electronegativity | 1.3 |
| Discovery year | 1952 |
Fermium is an element number 100 from actinoids family. Its symbol is Fm. Fermium atomic weight is 257.0951 amu. Fm has no stable or long lived isotopes. Fermium electronic configuration is 1s22s22p63s23p63d104s24p64d104f145s25p65d106s26p67s25f12. Fermium density is 9.7 g/cm3 (STP). Fermium melting point is 1527 °C. Fermium first ionization potential is 6.498 eV. Fermium first ionization potential is 0.350 eV. Fermium electronegativity by Pauling scale is 1.3. Fermium was discovered in 1952.
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