Final answer:
The + and - values of redox potential indicate the relative oxidizing or reducing strength of a species. A compound with a positive value is a poor electron donor, while a compound with a negative value is a better electron donor.
Step-by-step explanation:
The + and - values of redox potential indicate the relative oxidizing or reducing strength of a species.
A compound with a positive value of redox potential is a poor electron donor compared to hydrogen. It has a tendency to accept electrons and act as an oxidizing agent. Examples of such compounds are oxygen and chlorine.
On the other hand, a compound with a negative value of redox potential is a better electron donor than hydrogen. It has a tendency to donate electrons and act as a reducing agent. Examples of such compounds are lithium and sodium.