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< Back Ruthenium  SEE PERIODIC TABLE   SEE FULL ARTICLE Atomic Number 44 Atomic Symbol Ru Atomic Weight 101.07 amu Group Transition, 8 Form Solid Density @ STP 12.1 g/cm3 Melting Point 2334 °C (4233.2 °F,2607.15 °K) Boiling Point 4150 °C (7502 °F, 4423.15 °K) Heat of Fusion 38.59 kJ/mol Heat of Vaporization 580 kJ/mol First Ionization Potential 7.36050 eV Electronegativity (on Pauling scale) 2.2 Specific Heat Capacity 0.238 J/g K Ground State Electron Configuration 4d7 5s1 Oxidation States +3 Stable Isotopes and Natural Abundance on Earth 96Ru, 5.52%; 98Ru, 1.88%; 99Ru, 12.7%; 100Ru, 12.6%; 101Ru, 17.0%; 102Ru, 31.6%; 104Ru, 18.7% Selected Radioisotopes 97Ru, 103Ru, 106Ru Atomic Radius 178 pm Crystal Structure Hexagonal Discovered by Klaus, 1844

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