reactions are processes in which one or more nuclides are produced from a collision between two nuclei or one nucleus and a subatomic particle. a. Chemical b. Nuclear

The definition provided describes reactions that involve the transformation of atomic nuclei through collisions between nuclei or between a nucleus and a subatomic particle. These types of reactions result in the formation of new nuclides and are associated with changes in the atomic structure and energy levels. **Answer:** **b. Nuclear** **Explanation:** - **Chemical Reactions** involve the rearrangement of electrons in atoms or molecules, leading to the formation or breaking of chemical bonds. They do not involve changes to the nuclei of the atoms. - **Nuclear Reactions** involve changes in the nucleus of an atom, leading to the transformation of one element into another or the production of different isotopes. These reactions often release or absorb significant amounts of energy. Since the process described involves the production of nuclides from collisions between nuclei or subatomic particles, it is classified as a **nuclear reaction**.