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This is Fermium.

Symbol Fm
Atomic number 100
Atomic mass (257) amu

Fermium, named after Enrico Fermi, was discovered in 1953. Like einsteinium, fermium was first isolated from the debris of the testing of the hydrogen-bomb in 1952. Because it is short-lived, scientists doubt that enough fermium will ever be obtained to be weighed.

See also

Periodic table of the elements