Americium vs Seaborgium

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PropertyAm AmericiumSg Seaborgium
Atomic number95106
SymbolAmSg
NameAmericiumSeaborgium
Categoryactinidetransition-metal
Standard Atomic Weight243 u271 u
Period77
GroupN/A6
Blockss
Phase at STPsolidN/A
Electron configuration[Rn]7s25f7[Rn]7s25f146d4
Oxidation states[2, 3, 4, 5, 6, 7][3, 4, 5, 6]
Electronegativity (Pauling)1.3N/A
Electron affinity0.1 eV0.85 eV
Density1.369000e+4 kg/m³3.500000e+4 kg/m³
Melting point1175.85 °C-273.15 °C
Boiling point2010.85 °C-273.15 °C
Discovery year19441974