Promethium vs Livermorium

← Back to Periodic Table
PropertyPm PromethiumLv Livermorium
Atomic number61116
SymbolPmLv
NamePromethiumLivermorium
Categorylanthanidepost-transition-metal
Standard Atomic Weight145 u293 u
Period67
GroupN/A16
Blocksp
Phase at STPsolidsolid
Electron configuration[Xe]6s24f5[Rn] 7s2 7p4 5f14 6d10(predicted)
Oxidation states[2, 3][-2, 2, 4]
Electronegativity (Pauling)N/AN/A
Electron affinity0.129 eV0.7 eV
Density7260 kg/m³1.290000e+4 kg/m³
Melting point1041.85 °C506.85 °C
Boiling point2999.85 °C861.85 °C
Discovery year19022000