Samarium vs Tantalum

← Back to Periodic Table
PropertySm SamariumTa Tantalum
Atomic number6273
SymbolSmTa
NameSamariumTantalum
Categorylanthanidetransition-metal
Standard Atomic Weight150.36 u180.94788 u
Period66
GroupN/A5
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f6[Xe]6s24f145d3
Oxidation states[0, 1, 2, 3][-3, -1, 0, 1, 2, 3, 4, 5]
Electronegativity (Pauling)1.171.5
Electron affinity0.156 eV0.322 eV
Density7520 kg/m³1.640000e+4 kg/m³
Melting point1073.85 °C3016.85 °C
Boiling point1793.85 °C5457.85 °C
Discovery year18781802