Ruthenium (Ru) — Element 44: Properties & Data | Aladdin Scientific
Ruthenium(Ru) — Element 44
Ruthenium (Ru) is a transition metal with atomic number 44 and atomic mass 101.1. It has melting point 2607 K (2334 °C), boiling point 4423 K (4150 °C), density 12.1 g/cm³. It sits in group 8 and period 5 of the periodic table and was discovered in 1827.
Key facts
| Atomic mass | 101.1000 u |
|---|---|
| Electron configuration | [Kr]5s1 4d7 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 2.2 |
| Atomic radius (van der Waals) | 207 pm |
| Ionization energy | 7.361 eV |
| Electron affinity | 1.05 eV |
| Melting point | 2607 K |
| Boiling point | 4423 K |
| Density | 12.1 g/cm³ |
| Standard state | Solid |
| Year discovered | 1827 |
Frequently asked questions
What is the electron configuration of ruthenium?
The ground-state electron configuration of ruthenium is [Kr]5s1 4d7.
What group and period is ruthenium in?
Ruthenium (Ru) is in group 8 and period 5 of the periodic table, classified as a transition metal.
What is the melting point of ruthenium?
Ruthenium melts at 2607 K (2334 °C).
What is the standard state of ruthenium?
Ruthenium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .