​What is Pathology - What are free radicals, and what do they do?

​What is Pathology - What are free radicals, and what do they do?
Free radicals are atoms or molecules with an unpaired electron in their outer orbit that are unstable and highly reactive. They have a tendency to self-propagate after being generated, producing new radicals in an autocatalytic chain of events. The most well-known free radicals are those produced from oxygen, such as: a) Superoxide (O2) b) Hydrogen peroxide (H2O2) c) Hydroxyl radical a) Superoxide (O2) b) Hydrogen peroxide (H2O2) c) Hydroxyl radical (OH1)