Home
PropertiesCalculatorFun
Fermium
(Fm)
2818323082
Fm
Category
Actinoid
Series
actinide
Relative atomic mass
257.0951
Density
13.51
Melting point (°C)
1342
Boiling point (°C)
3100
Electronegativity (Pauling)
1.28
Half-life
100.5 d
Discovery year
1949
Discovered by
Glenn T. Seaborg
Electrons: 100
Protons: 100
Neutrons: 157

Wikipedia

Wikipedia
Decay chain
  1. Fm-257(100.5 d)
    α decay
  2. Cf-253(17.8 d)
    β⁻ decay
  3. Es-253(20.5 d)
    α decay
  4. Bk-249(330 d)
    β⁻ decay
  5. Cf-249(351 y)
    α decay
  6. Cm-245(8500 y)
    α decay
  7. Pu-241(14.3 y)
    β⁻ decay
  8. Am-241(432.2 y)
    α decay
  9. Np-237(2.14×10⁶ y)
    α decay
  10. Bi-209(stable)stable
created by @lukaswyss
Fermium (Fm) – Element 100