Neptunium vs Oganesson

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PropertyNp NeptuniumOg Oganesson
Atomic number93118
SymbolNpOg
NameNeptuniumOganesson
Categoryactinidenoble-gas
Standard Atomic Weight237 u294 u
Period77
GroupN/A18
Blocksp
Phase at STPsolidgas
Electron configuration[Rn]7s25f46d1[Rn] 7s2 7p6 5f14 6d10(predicted)
Oxidation states[2, 3, 4, 5, 6, 7][-1, 0, 1, 2, 4, 6]
Electronegativity (Pauling)1.36N/A
Electron affinity0.48 eV0.056 eV
Density2.025000e+4 kg/m³7000 kg/m³
Melting point643.85 °C-273.15 °C
Boiling point3901.85 °C-243.15 °C
Discovery year19402006