Here's why:
* Oxidation is the process of losing electrons.
* Reduction is the process of gaining electrons.
In the formation of chlorine gas, the following reaction occurs:
2 Cl⁻ → Cl₂ + 2e⁻
* Chloride ions (Cl⁻) each have a charge of -1, meaning they have gained one electron.
* In the formation of chlorine gas (Cl₂), they lose these electrons to become neutral chlorine atoms.
* These neutral chlorine atoms then bond together to form chlorine gas.
Since the chloride ions lose electrons, this process is classified as oxidation.
It's important to remember that oxidation and reduction always occur together in a process called redox reaction. In this case, the chlorine ions are oxidized while something else is reduced. This could be another element or compound that gains the electrons lost by the chloride ions.
