Ruthenium (Ru)
Ruthenium (Ru) is element 44 of the periodic table, a transition metal in period 5 and group 8. Its standard atomic weight is 101.07, so one mole of ruthenium atoms has a mass of 101.07 g. At room temperature it is a solid; it melts at 2333.85 °C and boils at 4149.85 °C.
| Atomic number | 44 |
|---|---|
| Symbol | Ru |
| Standard atomic weight | 101.07 |
| Molar mass | 101.07 g/mol |
| Category | Transition metal |
| Group | 8 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 5s1 4d7 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 2.2 |
| Atomic radius (van der Waals) | 207 pm |
| First ionisation energy | 7.361 eV (710.2 kJ/mol) |
| Electron affinity | 1.05 eV |
| State at room temperature | Solid |
| Melting point | 2607 K (2333.85 °C) |
| Boiling point | 4423 K (4149.85 °C) |
| Density | 12.1 g/cm³ |
| Discovered | 1827 |
Group 8
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Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.