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44Ru101.072
Ruthenium
Transition MetalRuthenium is a chemical element with symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table. Like the other metals of the platinum group, ruthenium is inert to most other chemicals.
Phase: SolidAppearance: silvery white metallic
2, 8, 18, 15, 1
Physical Properties
Atomic Mass101.072 u
Density12.45 g/cm³
Melting Point2607 K
Boiling Point4423 K
Molar Heat24.06 J/(mol·K)
Period5
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1 4d7
Semantic Config[Kr] 4d7 5s1
Shells2, 8, 18, 15, 1
Electron Affinity100.96 kJ/mol
Electronegativity2.2
Ionization Energies
IE1: 710.2 kJ/molIE2: 1620 kJ/molIE3: 2747 kJ/mol
Discovery
Discovered byKarl Ernst Claus