A<unk>  ion is the negatively charged form <unk> −) of the element<unk> , a member of the halogens group on the periodic table. Most<unk> s are colorless.<unk> s have many practical roles- anticonvulsant, plasma etching, solvent- grignard reagent, crystal formation, etc. Although uncommon, chronic toxicity from<unk>  can result in<unk> omism, a syndrome with multiple neurological symptoms.<unk>  toxicity can also cause a type of skin eruption. See potassium<unk> . The<unk>  ion has an ionic radius of 196 pm.
Bromide
Nitrate
Fluoride
Saline 
Carbonated water
Hydrogen fluoride
Isothiocyanate
Phosphine