In a chemical reaction, the element that is most likely to be reduced is typically the one that has the highest affinity for electrons. This often corresponds to elements that are more electronegative or those that are good oxidizing agents.
In many reactions, elements like oxygen, halogens (like fluorine and chlorine), and some transition metals (like silver and gold) are commonly reduced. To determine which element is reduced in a specific reaction, you would need to look at the change in oxidation states for the elements involved.
In general, if you provide the specific reaction you’re referring to, I can help identify which element is likely to be reduced.