Fluoride's the reduced form of fluorine. Both organic and inorganic compounds containing the element fluorine are considered fluorides. Fluoride, like other halides,'s a monovalent ion (−1 charge) anion. But as the lightest halide, its compounds often have properties that're distinctive. Chemically and structurally, fluoride resembles hydroxide. Fluorides range from severe toxins such as sarin to life-saving pharmaceuticals such as efavirenz and from refractory materials such as calcium fl… (More on Fluoride)