Ruthenium vs Roentgenium

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PropertyRu RutheniumRg Roentgenium
Atomic number44111
SymbolRuRg
NameRutheniumRoentgenium
Categorytransition-metaltransition-metal
Standard Atomic Weight101.07 u281 u
Period57
Group811
Blockss
Phase at STPsolidN/A
Electron configuration[Kr]5s14d7[Rn] 7s2 5f14 6d9(predicted)
Oxidation states[-4, -2, 1, 2, 3, 4, 5, 6, 7, 8][-1, 1, 3, 5]
Electronegativity (Pauling)2.2N/A
Electron affinity1.05 eV1.6 eV
Density1.210000e+4 kg/m³2.870000e+4 kg/m³
Melting point2333.85 °C-273.15 °C
Boiling point4149.85 °C-273.15 °C
Discovery year18281994