Name : Fermium Symbol : Fm Atomic # : 100 Atom weight: 257 (Calculated value) Melting P. : Boiling P. : Oxidation : +3 Pronounced : FER-mi-em From : Named in honor of Enrico Fermi Identified : Albert Ghiorse and others in 1952 (see element 98) Appearance : Radioactive, synthetic metal Note : Heavy metal [Properties] Fermium has isotopes with mass numbers between 243 and 258.