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Astronomy Chemical element

Fermium

Fermium (Fm) is a synthetic, radioactive chemical element belonging to the category Inner transition metal (actinide), with atomic number 100 and atomic mass 257.0000 u. This sheet describes its fundamental properties, periodic position and physical characteristics.

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Astronomy · Chemical element

Fermium

EL2S

Identity

  • Name: Fermium
  • Symbol: Fm
  • Atomic number: 100
  • Atomic mass: 257.0000 u

Position in the periodic table

  • Group: 3
  • Period: 7
  • Category: Inner transition metal (actinide)

Physico-chemical properties

  • Standard state: Solid (synthetic, radioactive)
  • Melting point: Approximately 1527°C
  • Density: Very high (not precisely determined)
  • Electron configuration: [Rn] 5f¹² 7s²

Scientific description

Fermium is a synthetic, radioactive chemical element with symbol Fm and atomic number 100. It belongs to the family of inner transition metals, within the actinide series, and occupies group 3 and period 7 in extended periodic tables. Its conventional atomic mass is taken as 257.0000 u, corresponding to its most stable isotope.