Chlorine vs Thallium

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PropertyCl ChlorineTl Thallium
Atomic number1781
SymbolClTl
NameChlorineThallium
Categoryhalogenpost-transition-metal
Standard Atomic Weight35.4515 u204.3835 u
Period36
Group1713
Blockpp
Phase at STPgassolid
Electron configuration[Ne]3s23p5[Xe]6s24f145d106p1
Oxidation states[-1, 1, 2, 3, 4, 5, 6, 7][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)3.161.62
Electron affinity3.6127 eV0.377 eV
Density3.214 kg/m³1.180000e+4 kg/m³
Melting point-101.5 °C303.85 °C
Boiling point-34.04 °C1472.85 °C
Discovery year17741861