BenchChem supplies high quality Selenium Tetrafluoride suitable for many research applications. Different packaging options are available to meet customer requirements. Selenium tetrafluoride is the fluoride of selenium. Used as a fluorinating agent in organic synthesis. Selenium is a non-metallic element with atomic number 34 and chemical symbol Se. Selenium rarely exists as an element in nature, and usually exists in sulfide ores (such as pyrite), partially replacing sulfur in the ore matrix. It may also be found in silver, copper, lead and nickel minerals. Although selenium salts are toxic in large amounts, the cellular function of most animals requires trace elements to form the active sites of glutathione peroxidase, thioredoxin reductase, and three known deiodinases.