Neptunium vs Nihonium

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PropertyNp NeptuniumNh Nihonium
Atomic number93113
SymbolNpNh
NameNeptuniumNihonium
Categoryactinidepost-transition-metal
Standard Atomic Weight237 u286 u
Period77
GroupN/A13
Blocksp
Phase at STPsolidsolid
Electron configuration[Rn]7s25f46d1[Rn] 5f14 6d10 7s2 7p1(predicted)
Oxidation states[2, 3, 4, 5, 6, 7]N/A
Electronegativity (Pauling)1.36N/A
Electron affinity0.48 eV0.6 eV
Density2.025000e+4 kg/m³1.600000e+4 kg/m³
Melting point643.85 °C426.85 °C
Boiling point3901.85 °C1156.85 °C
Discovery year19402004