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[ ? ] Transuranic element:
Radioactive and toxic.

Fermium is a chemical element, having the chemical symbol Fm. Its atomic number (the number of protons) is 100. It has a standard atomic weight of 257 g•mol −1 and it is a solid in its elemental form.

Fermium is considered a member of the "Transuranic" class of elements. At a pressure of 101.325 kPa, it has a melting point of 1,527 °C. There is no data available regarding its boiling point.

It was named after the Nobel laureate Enrico Fermi and was first identified in December 1952 by Albert Ghiorso and co-workers at the University of California, Berkeley in collaboration with the Argonne and Los Alamos National Laboratories. It was found in coral contaminated by the Ivy Mike nuclear test on November 1, 1952 at Enewetak Atoll in the Pacific Ocean.[1][2][3]