100

Fm

Fermium
[ 252 ]
 Historical Information

Fermium was identified by Ghiorso and coworkers (Berkeley, California, USA) in 1952 in the radioactive debris from a thermonuclear explosion in the Pacific. Somewhat remarkably, the fermium isotope discovered was made through the combination of 238U with 17 neutrons. Today, many isotopes are known spanning the mass range 243-258.

Basic Information Shells
  • Name: Fermium
  • Symbol: Fm
  • Atomic number: 100
  • Atomic weight: [ 252 ]
  • Standard state: solid at 298 K
  • Group in periodic table:
  • Group name:Actinoid
  • Period in periodic table: 7
  • Block in periodic table: f-block
  • Classification: Metallic
 fermium
Uses Trivia
  • It has no uses.

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.