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Both copper and chromium exhibit unique electronic configurations in their respective elements. Chromium, with an atomic number of 24, has the configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵. Similarly, copper, with an atomic number of 29, has the configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰. Explain the anomalous behaviour of copper.Copper (Cu) has atomic number 29. Its expected electronic configuration is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 9. The 3d orbital is neither half-filled nor fully filled. Hence, it has less stability. Due to interelectronic repulsion forces, one 4s electron enters into a 3d orbital. This makes 3d orbital completely filled and 4s orbital half-filled which gives extra stability and the electronic configuration of Cu becomes, 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 ... The arrangement of electrons in Copper in specific rules in different orbits and orbitals is called the electron configuration of Copper. The electron configuration of Copper is [Ar] 3d10 4s1 if the electron arrangement is through orbitals. Learn how to draw the electron configuration diagram for copper and understand its unique properties in the periodic table.
