Ruthenium vs Thallium

← Back to Periodic Table
PropertyRu RutheniumTl Thallium
Atomic number4481
SymbolRuTl
NameRutheniumThallium
Categorytransition-metalpost-transition-metal
Standard Atomic Weight101.07 u204.3835 u
Period56
Group813
Blocksp
Phase at STPsolidsolid
Electron configuration[Kr]5s14d7[Xe]6s24f145d106p1
Oxidation states[-4, -2, 1, 2, 3, 4, 5, 6, 7, 8][-5, -2, -1, 1, 2, 3]
Electronegativity (Pauling)2.21.62
Electron affinity1.05 eV0.377 eV
Density1.210000e+4 kg/m³1.180000e+4 kg/m³
Melting point2333.85 °C303.85 °C
Boiling point4149.85 °C1472.85 °C
Discovery year18281861