<unk>  () is an inorganic, monatomic anion of<unk> , with the chemical formula (also written ), whose salts are typically white or colorless.<unk>  salts typically have distinctive bitter tastes, and are odorless. Its salts and minerals are important chemical reagents and industrial chemicals, mainly used in the production of hydrogen<unk>  for fluorocarbons.<unk>  is classified as a weak base since it only partially associates in solution, but concentrated<unk>  is corrosive and can attack the skin.<unk>  is the simplest<unk>  anion. In terms of charge and size, the<unk>  ion resembles the hydroxide ion.<unk>  ions occur on Earth in several minerals, particularly<unk> , but are present only in trace quantities in bodies of water in nature.
Fluoride
Phosphine
Phosphate
Bromide
Chorus
Saline 
Hydrogen fluoride
Goitrogen