Case: Read the passage and answer the following questions

A property of a reaction called molecularity helps in understanding its mechanism. The number of reacting species (atoms, ions, or molecules) taking part in an elementary reaction, which must collide simultaneously in order to bring about a chemical reaction is called molecularity of a reaction.

Molecularity of a reaction is equal to the total number of which of the following?

Reactants take part in the elementary steps

Molecularity of a reaction is equal to the total number of reactants taking part in an elementary step. It is defined as the number of molecules or ions that participate in the rate determining step.