Calcium vs Thallium

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PropertyCa CalciumTl Thallium
Atomic number2081
SymbolCaTl
NameCalciumThallium
Categoryalkaline-earth-metalpost-transition-metal
Standard Atomic Weight40.078 u204.3835 u
Period46
Group213
Blocksp
Phase at STPsolidsolid
Electron configuration[Ar]4s2[Xe]6s24f145d106p1
Oxidation states[1, 2][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)11.62
Electron affinity0.0245 eV0.377 eV
Density1540 kg/m³1.180000e+4 kg/m³
Melting point841.85 °C303.85 °C
Boiling point1483.85 °C1472.85 °C
Discovery year18081861