Potassium vs Ruthenium

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PropertyK PotassiumRu Ruthenium
Atomic number1944
SymbolKRu
NamePotassiumRuthenium
Categoryalkali-metaltransition-metal
Standard Atomic Weight39.0983 u101.07 u
Period45
Group18
Blockss
Phase at STPsolidsolid
Electron configuration[Ar]4s1[Kr]5s14d7
Oxidation states[-1, 1][-4, -2, 1, 2, 3, 4, 5, 6, 7, 8]
Electronegativity (Pauling)0.822.2
Electron affinity0.5014 eV1.05 eV
Density890 kg/m³1.210000e+4 kg/m³
Melting point63.38 °C2333.85 °C
Boiling point758.85 °C4149.85 °C
Discovery year18071828