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Question
Write the outer electronic configuration of the following using the orbital notation method. Justify.
Cu (belongs to period 4 and group 11)
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Solution
- Cu belongs to period 4. Therefore, n = 4.
- Group 11 indicates that the element belongs to the d-block of the modern periodic table.
- The general outer electronic configuration of the d-block elements is ns0-2 (n–1)d1-10.
- The expected configuration of Cu is 4s23d9. However, the observed configuration of Cu is 4s13d10. This is due to the extra stability associated with completely filled d-subshell. Thus, the outer electronic configuration of Cu is 4s13d10.
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