Actinium vs Nihonium

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PropertyAc ActiniumNh Nihonium
Atomic number89113
SymbolAcNh
NameActiniumNihonium
Categoryactinidepost-transition-metal
Standard Atomic Weight227 u286 u
Period77
GroupN/A13
Blocksp
Phase at STPsolidsolid
Electron configuration[Rn]7s26d1[Rn] 5f14 6d10 7s2 7p1(predicted)
Oxidation states[3]N/A
Electronegativity (Pauling)1.1N/A
Electron affinity0.35 eV0.6 eV
Density1.007000e+4 kg/m³1.600000e+4 kg/m³
Melting point1050.85 °C426.85 °C
Boiling point3197.85 °C1156.85 °C
Discovery year18992004