Neptunium vs Bohrium

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PropertyNp NeptuniumBh Bohrium
Atomic number93107
SymbolNpBh
NameNeptuniumBohrium
Categoryactinidetransition-metal
Standard Atomic Weight237 u270 u
Period77
GroupN/A7
Blockss
Phase at STPsolidN/A
Electron configuration[Rn]7s25f46d1[Rn]7s25f146d5
Oxidation states[2, 3, 4, 5, 6, 7][3, 4, 5, 7]
Electronegativity (Pauling)1.36N/A
Electron affinity0.48 eV0.44 eV
Density2.025000e+4 kg/m³3.710000e+4 kg/m³
Melting point643.85 °C-273.15 °C
Boiling point3901.85 °C-273.15 °C
Discovery year19401976