Thallium vs Francium

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PropertyTl ThalliumFr Francium
Atomic number8187
SymbolTlFr
NameThalliumFrancium
Categorypost-transition-metalalkali-metal
Standard Atomic Weight204.3835 u223 u
Period67
Group131
Blockps
Phase at STPsolidsolid
Electron configuration[Xe]6s24f145d106p1[Rn]7s1
Oxidation states[-5, -2, -1, 1, 2, 3][1]
Electronegativity (Pauling)1.620.7
Electron affinity0.377 eV0.491 eV
Density1.180000e+4 kg/m³1870 kg/m³
Melting point303.85 °C26.85 °C
Boiling point1472.85 °C-273.15 °C
Discovery year18611939