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| Atomic Number | 44 |
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| Atomic Symbol | Ru |
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| Atomic Weight | 101.07 amu |
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| Group | Transition, 8 |
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| Form | Solid |
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| Density @ STP | 12.1 g/cm3 |
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| Melting Point | 2334 °C (4233.2 °F,2607.15 °K) |
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| Boiling Point | 4150 °C (7502 °F, 4423.15 °K) |
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| Heat of Fusion | 38.59 kJ/mol |
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| Heat of Vaporization | 580 kJ/mol |
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| First Ionization Potential | 7.36050 eV |
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| Electronegativity (on Pauling scale | 2.2 |
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| Specific Heat Capacity | 0.238 J/g K |
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| Ground State Electron Configuration | 4d7 5s1 |
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| Oxidation State(s) | +3 |
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| 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% |
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| Selected Radioisotopes | 97Ru, 103Ru, 106Ru |
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| Atomic Radius | 178 pm |
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| Crystal Structure | Hexagonal |
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| Discovered by | Klaus, 1844
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