The loss of electrons by an atom, ion, or molecule during a chemical reaction, resulting in an increase in its oxidation state. Oxidation is half of every redox reaction.
Definition
The loss of electrons by an atom, ion, or molecule during a chemical reaction, resulting in an increase in its oxidation state.
💡 Intuition
Giving away electrons. Originally meant 'gaining oxygen' but it's broader.
🎯 Core Idea
OIL RIG: Oxidation Is Loss of electrons — always paired with reduction in a redox reaction.
Example
Notation
e^- denotes an electron. The arrow in a half-reaction shows the direction of electron loss. Oxidation numbers are written as +n or -n above the element symbol.
🌟 Why It Matters
Oxidation is half of every redox reaction. It powers batteries and fuel cells, causes corrosion that costs billions in infrastructure damage annually, and drives metabolic energy production in every living cell.
💭 Hint When Stuck
When identifying oxidation in a reaction, track electron movement. First assign oxidation numbers to each atom before and after the reaction. Then find which atoms increased in oxidation number — those were oxidized. Finally, remember OIL RIG: Oxidation Is Loss of electrons.
Formal View
Related Concepts
See Also
🚧 Common Stuck Point
Oxidation doesn't require oxygen — it's defined by electron loss, not by reacting with oxygen gas.
⚠️ Common Mistakes
- Believing oxidation always involves oxygen gas — the name is historical; oxidation is defined purely by electron loss
- Forgetting that oxidation and reduction always occur together — if one species is oxidized, another must be reduced
- Confusing the oxidized species with the oxidizing agent — the substance that gets oxidized is actually the reducing agent
Frequently Asked Questions
What is Oxidation in Chemistry?
The loss of electrons by an atom, ion, or molecule during a chemical reaction, resulting in an increase in its oxidation state.
When do you use Oxidation?
When identifying oxidation in a reaction, track electron movement. First assign oxidation numbers to each atom before and after the reaction. Then find which atoms increased in oxidation number — those were oxidized. Finally, remember OIL RIG: Oxidation Is Loss of electrons.
What do students usually get wrong about Oxidation?
Oxidation doesn't require oxygen — it's defined by electron loss, not by reacting with oxygen gas.
Visualization
StaticVisual representation of Oxidation