Rhodium
Transition Metal
Rhodium (Rh) is a chemical element with atomic number 45, classified as a transition metal. At room temperature it is a solid. It was discovered in 1803 by William Hyde Wollaston.
Properties
- Atomic number
- 45
- Atomic mass
- 102.91 u
- Category
- Transition Metal
- Group
- 9
- Period
- 5
- Block
- d-block
- Electron configuration
- [Kr] 4d⁸ 5s¹
- Phase at STP
- Solid
- Density
- 12.41 g/cm³
- Melting point
- 2237 K (1963.8 °C)
- Boiling point
- 3968 K (3694.8 °C)
- Electronegativity
- 2.28
- Atomic radius
- 173 pm
- Ionization energy
- 7.459 eV
- Discovery
- 1803 · William Hyde Wollaston
Common uses
Catalytic converters, jewelry, mirrors, electrical contacts
Did you know?
Most expensive precious metal and essential for cleaning car exhaust.
Experiment with the elements
Rhodium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.