Ruthenium
Transition Metal
Ruthenium (Ru) is a chemical element with atomic number 44, classified as a transition metal. At room temperature it is a solid. It was discovered in 1844 by Karl Ernst Claus.
Properties
- Atomic number
- 44
- Atomic mass
- 101.07 u
- Category
- Transition Metal
- Group
- 8
- Period
- 5
- Block
- d-block
- Electron configuration
- [Kr] 4d⁷ 5s¹
- Phase at STP
- Solid
- Density
- 12.37 g/cm³
- Melting point
- 2607 K (2333.8 °C)
- Boiling point
- 4423 K (4149.9 °C)
- Electronegativity
- 2.2
- Atomic radius
- 178 pm
- Ionization energy
- 7.361 eV
- Discovery
- 1844 · Karl Ernst Claus
Common uses
Electronics, catalysts, jewelry, solar cells
Did you know?
One of the rarest elements on Earth and extremely valuable.