Element 45
Rhodium
Transition metals
Rhodium (Rh) is in the d-block of the periodic table — group 9, period 5.
Rhodium is a chemical element with symbol Rh and atomic number 45.
Key data
- Atomic number
- 45
- Atomic mass
- 102.906 u
- Group / Period
- 9 / 5
- Block
- d-block
- Phase at STP
- Solid
- Density
- 12.41 g/cm³
- Melting point
- 1963.8 °C
- Boiling point
- 3694.8 °C
- Electron configuration
- [Kr] 4d8 5s1
Periodic table block
Rhodium is in the d-block (group 9, period 5). Elements land in the d-block when their highest-energy electrons fill a d subshell — these are the transition metals in the middle of the table.
New to this? Periodic table blocks explained: s, p, d, and f
Common uses
- •Catalytic converters
- •Jewelry plating
- •Mirrors
Discovery
Year: 1803
Discovered by: William Hyde Wollaston
Frequently asked questions
What is the atomic number of Rhodium?
Rhodium has atomic number 45. Its symbol is Rh and its atomic mass is 102.906 u.
What category of element is Rhodium?
Rhodium is classified as transition metals. It sits in group 9, period 5 of the periodic table.
What block of the periodic table is Rhodium in?
Rhodium is in the d-block (group 9, period 5). Its highest-energy electrons occupy the d subshell — you can see this in its electron configuration, [Kr] 4d8 5s1.
What is Rhodium used for?
Common uses of Rhodium include: Catalytic converters, Jewelry plating, Mirrors.
When was Rhodium discovered?
Rhodium was discovered in 1803 by William Hyde Wollaston.
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