Phosphorus vs Thallium

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PropertyP PhosphorusTl Thallium
Atomic number1581
SymbolPTl
NamePhosphorusThallium
Categorynonmetalpost-transition-metal
Standard Atomic Weight30.973762 u204.3835 u
Period36
Group1513
Blockpp
Phase at STPsolidsolid
Electron configuration[Ne]3s23p3[Xe]6s24f145d106p1
Oxidation states[-3, -2, -1, 0, 1, 2, 3, 4, 5][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)2.191.62
Electron affinity0.7466 eV0.377 eV
Density1820 kg/m³1.180000e+4 kg/m³
Melting point44.15 °C303.85 °C
Boiling point280.5 °C1472.85 °C
Discovery year16691861