Mendelevium vs Seaborgium

← Back to Periodic Table
PropertyMd MendeleviumSg Seaborgium
Atomic number101106
SymbolMdSg
NameMendeleviumSeaborgium
Categoryactinidetransition-metal
Standard Atomic Weight258 u271 u
Period77
GroupN/A6
Blockss
Phase at STPsolidN/A
Electron configuration[Rn]7s25f13[Rn]7s25f146d4
Oxidation states[2, 3][3, 4, 5, 6]
Electronegativity (Pauling)1.3N/A
Electron affinity0.997 eV0.85 eV
Density1.030000e+4 kg/m³3.500000e+4 kg/m³
Melting point826.85 °C-273.15 °C
Boiling point-273.15 °C-273.15 °C
Discovery year19551974