Thallium vs Rutherfordium

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PropertyTl ThalliumRf Rutherfordium
Atomic number81104
SymbolTlRf
NameThalliumRutherfordium
Categorypost-transition-metaltransition-metal
Standard Atomic Weight204.3835 u263 u
Period67
Group134
Blockps
Phase at STPsolidsolid
Electron configuration[Xe]6s24f145d106p1[Rn]7s25f146d2
Oxidation states[-5, -2, -1, 1, 2, 3][3, 4]
Electronegativity (Pauling)1.62N/A
Electron affinity0.377 eV0.65 eV
Density1.180000e+4 kg/m³2.330000e+4 kg/m³
Melting point303.85 °C2126.85 °C
Boiling point1472.85 °C5526.85 °C
Discovery year18611964