45
Rh
102.91
Rhodium (Rh)
Element 45 · Period 5 · Group 9
transition-metal
solid at room temp
d-block
About Rhodium
Extremely rare platinum metal. Used in catalytic converters and jewelry plating.
Physical Properties
Atomic Mass
102.91 u
State at 25°C
Solid
Melting Point
1964 °C
Boiling Point
3695 °C
Density
12.41 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Kr] 4d⁸ 5s¹
Electron Shells
2, 8, 18, 16, 1
Electronegativity
2.28
Atomic Radius
173 pm
Ionization Energy
720 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
William Hyde Wollaston
Discovery Year
1804
Named By
William Hyde Wollaston
Name origin: Greek: rhodon (rose)
Frequently Asked Questions
- Is Rhodium a metal, nonmetal, or metalloid?
- Rhodium is classified as a transition-metal.
- What state is Rhodium in at room temperature?
- Rhodium is a solid at standard room temperature (25°C).
- What is the atomic mass of Rhodium?
- Rhodium has an atomic mass of 102.91 atomic mass units (u).
- Who discovered Rhodium?
- Rhodium was discovered by William Hyde Wollaston in 1804.
- Where is Rhodium on the periodic table?
- Rhodium is element number 45, located in period 5 and group 9.