Science Periodic Table - Elements - Fermium Symbol Fm Atomic Number 100 Relative Atomic Mass 12C = 12.0000 257.0951 (257Fm) Atomic Radius pm n/a First Ionisation Energy kJ mol-1 627 Electronegativity 1.3 Density kg m-3 n/a Molar Volume cm3 n/a Thermal Conductivity W m-1 K-1 10 [300 K] (est.) Melting Point K n/a Boiling Point K n/a Number of Isotopes 20 Ground State Electron Configuration [Rn]5f127s2 Term Symbol 3H6 Discovery Discovered by G.R. Choppin, S.G.Thompson, A. Ghiorso and B.G. Harvey in the debris of the thermonuclear explosion in the Pacific in 1952 Name Derived From Named after Enrico Fermi Name in Other Languages  Croatian Fermij  Danish fermium  Dutch fermium  Finnish fermium  French fermium  German Fermium  Italian fermio  Norwegian fermium  Portuguese férmio  Spanish fermio  Swedish fermium Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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