Neptunium vs Flerovium

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PropertyNp NeptuniumFl Flerovium
Atomic number93114
SymbolNpFl
NameNeptuniumFlerovium
Categoryactinidepost-transition-metal
Standard Atomic Weight237 u289 u
Period77
GroupN/A14
Blocksp
Phase at STPsolidgas
Electron configuration[Rn]7s25f46d1[Rn] 7s27p2 5f14 6d10(predicted)
Oxidation states[2, 3, 4, 5, 6, 7][0, 1, 2, 4, 6]
Electronegativity (Pauling)1.36N/A
Electron affinity0.48 eV-0.5 eV
Density2.025000e+4 kg/m³9928 kg/m³
Melting point643.85 °C-273.15 °C
Boiling point3901.85 °C-63.15 °C
Discovery year19401998