Teacher:Given a scientific passage and an answer, generate a question for the given answer.
Teacher: Now, understand the problem? Solve this instance: Passage: The number of reactant molecules in an elementary step is referred to as its molecularity. The vast majority of elementary steps are unimolecular or bimolecular. Answer: molecularity
Student:
What property is associated with the number of reactant molecules involved in an elementary step?