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.