This is an unstable arrangement of atoms that exists momentarily at the peak of the activation-energy barrier during a chemical reaction. It's the state of transition between reactants and products.
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Transition State: Another term for activated complex; it represents the highest energy configuration of atoms during a chemical reaction.
Activation Energy: The minimum amount of energy required to initiate a chemical reaction.
Potential Energy Diagram: A diagram that shows the changes in potential energy that occurs during a chemical reaction; it helps visualize activation energy and activated complex.