Lanthanum vs Iridium

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PropertyLa LanthanumIr Iridium
Atomic number5777
SymbolLaIr
NameLanthanumIridium
Categorylanthanidetransition-metal
Standard Atomic Weight138.90547 u192.217 u
Period66
GroupN/A9
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s25d1[Xe]6s24f145d7
Oxidation states[0, 1, 2, 3][-3, -2, -1, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Electronegativity (Pauling)1.12.2
Electron affinity0.47 eV1.565 eV
Density6150 kg/m³2.256220e+4 kg/m³
Melting point917.85 °C2445.85 °C
Boiling point3463.85 °C4427.85 °C
Discovery year18391803