Erbium vs Tantalum

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PropertyEr ErbiumTa Tantalum
Atomic number6873
SymbolErTa
NameErbiumTantalum
Categorylanthanidetransition-metal
Standard Atomic Weight167.259 u180.94788 u
Period66
GroupN/A5
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f12[Xe]6s24f145d3
Oxidation states[0, 1, 2, 3][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)1.241.5
Electron affinity0.312 eV0.322 eV
Density9070 kg/m³1.640000e+4 kg/m³
Melting point1528.85 °C3016.85 °C
Boiling point2867.85 °C5457.85 °C
Discovery year18431802