Technetium vs Thallium

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PropertyTc TechnetiumTl Thallium
Atomic number4381
SymbolTcTl
NameTechnetiumThallium
Categorytransition-metalpost-transition-metal
Standard Atomic Weight98 u204.3835 u
Period56
Group713
Blocksp
Phase at STPsolidsolid
Electron configuration[Kr]5s24d5[Xe]6s24f145d106p1
Oxidation states[-3, -1, 1, 2, 3, 4, 5, 6, 7][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)1.91.62
Electron affinity0.55 eV0.377 eV
Density1.100000e+4 kg/m³1.180000e+4 kg/m³
Melting point2156.85 °C303.85 °C
Boiling point4264.85 °C1472.85 °C
Discovery year19371861