Iridium vs Rutherfordium

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PropertyIr IridiumRf Rutherfordium
Atomic number77104
SymbolIrRf
NameIridiumRutherfordium
Categorytransition-metaltransition-metal
Standard Atomic Weight192.217 u263 u
Period67
Group94
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f145d7[Rn]7s25f146d2
Oxidation states[-3, -2, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9][3, 4]
Electronegativity (Pauling)2.2N/A
Electron affinity1.565 eV0.65 eV
Density2.256220e+4 kg/m³2.330000e+4 kg/m³
Melting point2445.85 °C2126.85 °C
Boiling point4427.85 °C5526.85 °C
Discovery year18031964