In chemistry, a '''radical''' (or free radical) is a particle with one or more unpaired electrons. Radicals are mostly very reactive and are presented with a point (for example: Hydroxyl radical HO'''·'''). | In chemistry, a '''radical''' (or free radical) is a particle with one or more unpaired electrons. Radicals are mostly very reactive and are presented with a point (for example: Hydroxyl radical HO'''·'''). |