Fermium
Chemical element
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Fermium is a synthetic chemical element; it has symbol Fm and atomic number 100. It is an actinide and the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in... Wikipedia
Symbol: Fm
Atomic number: 100
Atomic mass: 257 u
Electron configuration: Rn 5f12 7s2
Discoverers: Albert Ghiorso and Glenn T. Seaborg
Discovered: 1953
Electrons per shell: 2,8,18,32,30,8,2