Rhodium (Rh) - Element 45 | Properties & Electron Configuration
What is Rhodium?
Rhodium (Rh) is element 45, a transition metal in period 5, group 9. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁸ 5s¹.
| Atomic Number | 45 |
| Symbol | Rh |
| Atomic Mass | 102.91 u |
| Category | Transition Metal |
| Period | 5 |
| Group | 9 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁸ 5s¹ |
| Short Config | [Kr] 4d⁸ 5s¹ |
| Electronegativity | 2.28 |
| Atomic Radius | 134 pm |
| Ionization Energy | 720 kJ/mol |
| Electron Affinity | 110 kJ/mol |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Rhodium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁸ 5s¹. In noble gas shorthand, this is written as [Kr] 4d⁸ 5s¹.
Rhodium is a d-block element in group 9, period 5.
Periodic Trends
Electronegativity: Rhodium has a Pauling electronegativity of 2.28. Within group 9, electronegativity generally decreases down the group.
Atomic Radius: 134 pm. Across period 5, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 720 kJ/mol. Ionization energy generally increases across a period and decreases down a group.
View all 118 elements with trend overlays for electronegativity, atomic radius, ionization energy, and electron affinity.
Explore Rhodium on the Interactive Periodic TableRelated Topics
Cobalt (Co)
Properties of Cobalt - same group as Rhodium
Iridium (Ir)
Properties of Iridium - same group as Rhodium
Meitnerium (Mt)
Properties of Meitnerium - same group as Rhodium
Rubidium (Rb)
Properties of Rubidium - same period as Rhodium
Strontium (Sr)
Properties of Strontium - same period as Rhodium
Yttrium (Y)
Properties of Yttrium - same period as Rhodium