Comparisons / Comparison of Fermium and Mendelevium

Comparison of Fermium and Mendelevium [S]ave

Attribute
Fermium
×

Mendelevium
×
Atomic mass (u)257.09511258.09843
Standard stateSolidSolid
Oxidation states
  • +3
  • +2
  • +3
Electron configuration[Rn]5f¹²7s²[Rn]7s²5f¹³
Ionization energy (eV)6.56.58
Electronegativity (pauling scale)1.31.3
Melting point (K)18001100
Atomic number100101
1Group nameActinideActinide
Discovered (year)19521955
SymbolFmMd



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