Cadmium (Cd) - Element 48 | Properties & Electron Configuration
What is Cadmium?
Cadmium (Cd) is element 48, a transition metal in period 5, group 12. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s².
| Atomic Number | 48 |
| Symbol | Cd |
| Atomic Mass | 112.41 u |
| Category | Transition Metal |
| Period | 5 |
| Group | 12 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² |
| Short Config | [Kr] 4d¹⁰ 5s² |
| Electronegativity | 1.69 |
| Atomic Radius | 151 pm |
| Ionization Energy | 868 kJ/mol |
| Electron Affinity | N/A |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Cadmium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s². In noble gas shorthand, this is written as [Kr] 4d¹⁰ 5s².
Cadmium is a d-block element in group 12, period 5.
Periodic Trends
Electronegativity: Cadmium has a Pauling electronegativity of 1.69. Within group 12, electronegativity generally decreases down the group.
Atomic Radius: 151 pm. Across period 5, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 868 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 Cadmium on the Interactive Periodic TableRelated Topics
Zinc (Zn)
Properties of Zinc - same group as Cadmium
Mercury (Hg)
Properties of Mercury - same group as Cadmium
Copernicium (Cn)
Properties of Copernicium - same group as Cadmium
Rubidium (Rb)
Properties of Rubidium - same period as Cadmium
Strontium (Sr)
Properties of Strontium - same period as Cadmium
Yttrium (Y)
Properties of Yttrium - same period as Cadmium