1. Identify the Oxidation

* Copper (Cu) is being oxidized because it goes from an elemental state (0 oxidation state) to a +1 oxidation state in CuCl.

2. Write the Half-Reaction

The oxidation half-reaction focuses only on the copper:

Cu(s) → Cu⁺(aq) + e⁻

Explanation

* Cu(s): Solid copper atoms lose an electron.

* Cu⁺(aq): Copper ions in solution (aqueous).

* e⁻: The electron that is lost.

Important Note: The chlorine (Cl₂) is being reduced in this reaction, and you would need to write a separate reduction half-reaction to fully represent the overall process.