Copper (Cu) - Element 29 | Properties & Electron Configuration
What is Copper?
Copper (Cu) is element 29, a transition metal in period 4, group 11. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹.
| Atomic Number | 29 |
| Symbol | Cu |
| Atomic Mass | 63.546 u |
| Category | Transition Metal |
| Period | 4 |
| Group | 11 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹ |
| Short Config | [Ar] 3d¹⁰ 4s¹ |
| Electronegativity | 1.9 |
| Atomic Radius | 128 pm |
| Ionization Energy | 745 kJ/mol |
| Electron Affinity | 119 kJ/mol |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Copper is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹. In noble gas shorthand, this is written as [Ar] 3d¹⁰ 4s¹.
Copper is a d-block element in group 11, period 4.
Periodic Trends
Electronegativity: Copper has a Pauling electronegativity of 1.9. Within group 11, electronegativity generally decreases down the group.
Atomic Radius: 128 pm. Across period 4, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 745 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 Copper on the Interactive Periodic TableRelated Topics
Silver (Ag)
Properties of Silver - same group as Copper
Gold (Au)
Properties of Gold - same group as Copper
Roentgenium (Rg)
Properties of Roentgenium - same group as Copper
Potassium (K)
Properties of Potassium - same period as Copper
Calcium (Ca)
Properties of Calcium - same period as Copper
Scandium (Sc)
Properties of Scandium - same period as Copper