Lanthanum vs Tantalum

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PropertyLa LanthanumTa Tantalum
Atomic number5773
SymbolLaTa
NameLanthanumTantalum
Categorylanthanidetransition-metal
Standard Atomic Weight138.90547 u180.94788 u
Period66
GroupN/A5
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s25d1[Xe]6s24f145d3
Oxidation states[0, 1, 2, 3][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)1.11.5
Electron affinity0.47 eV0.322 eV
Density6150 kg/m³1.640000e+4 kg/m³
Melting point917.85 °C3016.85 °C
Boiling point3463.85 °C5457.85 °C
Discovery year18391802