What is exchanged between the species taking part in a redox reaction?

1. Reactions in aqueous solution fall into two broad families. 2. In ion exchange reactions the positive ions swap their partner negative ions. 3. In redox reactions something else moves instead. 4. One species loses electrons and becomes more positive. 5. The other species gains those electrons and becomes more negative. 6. So it is electrons that are transferred in a redox reaction. 7. You spot one by checking whether the charges have shifted, one up and one down. 8. Protons and neutrons stay locked in their nuclei during ordinary chemistry. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 18: Reactions in aqueous solution_