In the energy profile of a reaction, the species that exists at the maximum on the curve is called the . In the energy profile of a reaction, the species that exists at the maximum on the curve is called the . atomic state activated complex activation energy enthalpy of reaction product

The activated complex

Explanation:

The activated complex are the species that exists maximum in every energy profile of a reaction.

Activated complex is nothing but an intermediate state of reactants formed during its conversion from a reactant to product state in coarse of reaction.

The activated complex is formed at the maximum energy level in the reaction path. And this difference between energy of the activated complex and the energy of the reactants is only known as activation energy