Name: fermium
Symbol: Fm
Atomic number: 100
Atomic weight: [ 257 ]
Group in periodic table:
Group name: Actinoid
Period in periodic table: 7 (actinoid)
Block in periodic table: f-block
CAS registry ID: 7440-72-4
Fermium's chemical properties are largely unknown. Fermium is a radioactive rare earth metal. The longest living isotope is is 257Fm with a half-life of 80 days. It is of no commercial importance.