Which term describes the unstable arrangement of the reacting particles as the reaction takes place?
reactants
activation energy
products
energy of reaction
activated complex

The term, which describes the unstable arrangement of the reacting particles as a chemical reaction takes place is ACTIVATED COMPLEX.

Activated complex is a point along the reaction path in which the reacting particles have the highest energy and the highest instability. Activated complex is a phase which all chemical reactants have to pass through before they become products. The phase is a temporary phase because of its instability. An activated complex will form products if it has enough energy to do so, otherwise, the activated complex break apart and revert to reactants.

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