Americium vs Nihonium

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PropertyAm AmericiumNh Nihonium
Atomic number95113
SymbolAmNh
NameAmericiumNihonium
Categoryactinidepost-transition-metal
Standard Atomic Weight243 u286 u
Period77
GroupN/A13
Blocksp
Phase at STPsolidsolid
Electron configuration[Rn]7s25f7[Rn] 5f14 6d10 7s2 7p1(predicted)
Oxidation states[2, 3, 4, 5, 6, 7]N/A
Electronegativity (Pauling)1.3N/A
Electron affinity0.1 eV0.6 eV
Density1.369000e+4 kg/m³1.600000e+4 kg/m³
Melting point1175.85 °C426.85 °C
Boiling point2010.85 °C1156.85 °C
Discovery year19442004