Tellurium vs Thallium

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PropertyTe TelluriumTl Thallium
Atomic number5281
SymbolTeTl
NameTelluriumThallium
Categorymetalloidpost-transition-metal
Standard Atomic Weight127.6 u204.3835 u
Period56
Group1613
Blockpp
Phase at STPsolidsolid
Electron configuration[Kr]5s24d105p4[Xe]6s24f145d106p1
Oxidation states[-2, -1, 0, 1, 2, 3, 4, 5, 6][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)2.11.62
Electron affinity1.9708 eV0.377 eV
Density6232 kg/m³1.180000e+4 kg/m³
Melting point449.51 °C303.85 °C
Boiling point987.85 °C1472.85 °C
Discovery year17821861