Ruthenium
Transition metal| Atomic number | 44 |
|---|---|
| Category | Transition metal |
| Atomic mass | 101.07 |
| Electron configuration | [Kr]4d⁷ 5s¹ |
| Oxidation states | +3, +4 |
| Electronegativity | 2.2 |
| Melting point | 2,334 °C |
| Boiling point | 4,150 °C |
| Density | 12.45 g/cm³ |
| Crystal structure | Close-packed hexagonal |
| Group | 8 |
| Period | 5 |
| Block | d |
| Discovered | 1,844 |
| Crustal abundance | 0.001 ppm |