Tantalum vs Thallium

← Back to Periodic Table
PropertyTa TantalumTl Thallium
Atomic number7381
SymbolTaTl
NameTantalumThallium
Categorytransition-metalpost-transition-metal
Standard Atomic Weight180.94788 u204.3835 u
Period66
Group513
Blocksp
Phase at STPsolidsolid
Electron configuration[Xe]6s24f145d3[Xe]6s24f145d106p1
Oxidation states[-3, -1, 0, 1, 2, 3, 4, 5][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)1.51.62
Electron affinity0.322 eV0.377 eV
Density1.640000e+4 kg/m³1.180000e+4 kg/m³
Melting point3016.85 °C303.85 °C
Boiling point5457.85 °C1472.85 °C
Discovery year18021861