Iodine vs Thallium

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PropertyI IodineTl Thallium
Atomic number5381
SymbolITl
NameIodineThallium
Categoryhalogenpost-transition-metal
Standard Atomic Weight126.90447 u204.3835 u
Period56
Group1713
Blockpp
Phase at STPsolidsolid
Electron configuration[Kr]5s24d105p5[Xe]6s24f145d106p1
Oxidation states[-1, 1, 2, 3, 4, 5, 6, 7][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)2.661.62
Electron affinity3.059 eV0.377 eV
Density4930 kg/m³1.180000e+4 kg/m³
Melting point113.7 °C303.85 °C
Boiling point184.4 °C1472.85 °C
Discovery year18111861