44Ru101.07
Ruthenium (Ru)
Element 44 Ā· Transition metal
Ruthenium (Ru) is a chemical element with atomic number 44. It is classified as a transition metal in period 5, group 8 of the periodic table (the d-block). Its standard atomic weight is 101.07 u and its ground-state electron configuration is [Kr] 4dā· 5sĀ¹.
Ruthenium facts
| Atomic number (Z) | 44 |
|---|---|
| Symbol | Ru |
| Standard atomic weight | 101.07 u |
| Category | Transition metal |
| Group | 8 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4dā· 5sĀ¹ |
| Electronegativity (Pauling) | 2.2 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 44 / 44 |
| Neutrons (most common isotope, approx.) | 57 |
| Molar mass | 101.07 g/mol |