# Write the outer electronic configuration of the following using the orbital notation method. Justify. Cu (belongs to period 4 and group 11) - Chemistry

Short Note

Write the outer electronic configuration of the following using the orbital notation method. Justify.

Cu (belongs to period 4 and group 11)

#### Solution

1. Cu belongs to period 4. Therefore, n = 4.
2. Group 11 indicates that the element belongs to the d-block of the modern periodic table.
3. The general outer electronic configuration of the d-block elements is ns0-2 (n–1)d1-10.
4. 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.
Concept: Periodic Table and Electronic Configuration
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#### APPEARS IN

Balbharati Chemistry 11th Standard Maharashtra State Board
Chapter 7 Modern Periodic Table
Exercises | Q 2. (C) | Page 108