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44
Ru
101.07
Ruthenium
Transition metals · Group 8 · Period 5
Atomic properties
| Atomic number | 44 |
|---|---|
| Symbol | Ru |
| Standard atomic weight | 101.07 |
| Classification | Transition metals |
| Group | 8 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4d7 5s1 |
| Electronegativity (Pauling) | 2.20 |
| Common oxidation states | +4, +3 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 12.45 g/cm³ |
| Melting point | 2334 °C |
| Boiling point | 4150 °C |
| Discovered | 1844 |
| CAS number | — |