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Fermio Fermio Document Transcript

  • 100FmFermio - FermiumMass:257 u[Rn] 5f127s2Melting point: unknownBoiling point: unknownDensity: unknowndiscovery: discovered by artificialnuclear transmutation of lighterelements in 1952Fermium is not found in nature, their discovery and production is achieved by artificialnuclear transmutation of lighter elements. It has been discovered radioactive isotopeswith mass numbers 244-259. The total weight of fermium that has been synthesized ismuch less than a millionth of gram.Spontaneous fission i the primary mode of decay for 244-Fm, 256-Fm and 258-Fm.Thelongest life isotope is 257-Fm,which has a half life of about 100 days.The fermium-258decays by spontaneous fission and has a half life of 0.38 milliseconds.This suggests theexistence of an abnormality at this point in the periodic table.