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.
Compounds you can make with ruthenium
Ruthenium appears in one compound in our periodic table sandbox. Each one is a real substance with its true chemical formula — combine the right elements in the right ratio below to discover it.
-
RuO2
Ruthenium(IV) Oxide
The electrode coating that produces most of the world's chlorine.