Ytterbium vs Thallium

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PropertyYb YtterbiumTl Thallium
Atomic number7081
SymbolYbTl
NameYtterbiumThallium
Categorylanthanidepost-transition-metal
Standard Atomic Weight173.054 u204.3835 u
Period66
GroupN/A13
Blocksp
Phase at STPsolidsolid
Electron configuration[Xe]6s24f14[Xe]6s24f145d106p1
Oxidation states[0, 1, 2, 3][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)N/A1.62
Electron affinity-0.02 eV0.377 eV
Density6900 kg/m³1.180000e+4 kg/m³
Melting point818.85 °C303.85 °C
Boiling point1195.85 °C1472.85 °C
Discovery year18781861