| Element | Ruthenium | Symbol | Ru |
| Atomic Number | 44 | Molar Mass | 101.07 gmol-1 |
| Electron Configuration | [Kr]4d75s1 | Normal State | solid metal |
| Density @STP | 12.36 g cm-3 | Melting Point | 2334oC |
| Boiling Point | 4150oC | Stable Isotopes | 96Ru, 98Ru, 99Ru, 100Ru, 101Ru, 102Ru, 104Ru |
| Atomic Radius | 134 pm | Ionic Radius | 77 (3+) pm |
| Electronegativity (Pauling) | 2.2 | Ionization Energy (1st) | 711 kJ mol-1 |
| Ionization Energy (2nd) | 1617 kJ mol-1 | Ionization Energy (3rd) | 2747 kJ mol-1 |
| Molar Heat Capacity | 24.1 J K-1mol-1 | Standard Molar Entropy | 28.5 J K-1mol-1 |
| Enthalpy of Fusion | 23.7 kJ mol-1 | Enthalpy of Vapourization | 567.8 kJ mol-1 |