Ruthenium vs Francium

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PropertyRu RutheniumFr Francium
Atomic number4487
SymbolRuFr
NameRutheniumFrancium
Categorytransition-metalalkali-metal
Standard Atomic Weight101.07 u223 u
Period57
Group81
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d7[Rn]7s1
Oxidation states[-4, -2, 1, 2, 3, 4, 5, 6, 7, 8][1]
Electronegativity (Pauling)2.20.7
Electron affinity1.05 eV0.491 eV
Density1.210000e+4 kg/m³1870 kg/m³
Melting point2333.85 °C26.85 °C
Boiling point4149.85 °C-273.15 °C
Discovery year18281939