Francium vs Seaborgium

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PropertyFr FranciumSg Seaborgium
Atomic number87106
SymbolFrSg
NameFranciumSeaborgium
Categoryalkali-metaltransition-metal
Standard Atomic Weight223 u271 u
Period77
Group16
Blockss
Phase at STPsolidN/A
Electron configuration[Rn]7s1[Rn]7s25f146d4
Oxidation states[1][3, 4, 5, 6]
Electronegativity (Pauling)0.7N/A
Electron affinity0.491 eV0.85 eV
Density1870 kg/m³3.500000e+4 kg/m³
Melting point26.85 °C-273.15 °C
Boiling point-273.15 °C-273.15 °C
Discovery year19391974