100
Fm
257
Fermium
Element 100 · 257 u · f-block
actinide
Named after Enrico Fermi. Also first found in H-bomb debris. Only produced in microscopic quantities.
Phase (STP)
Solid
Melting Point
1527 °C
Boiling Point
—
Density
—
Electronegativity
1.3
Atomic Radius
—
Ionization Energy
627 kJ/mol
Electron Affinity
—
Discovered
1952 · Albert Ghiorso
Electron Configuration
[Rn] 5f12 7s2
Electron Orbitals
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