The nonmetallic character of selenium is shown by its brittleness and the low electrical conductivity (~10 to 10 S•cm) of its highly purified form. This is comparable to or less than that of bromine (7.95 × 10 S•cm), a nonmetal. Selenium has the electronic band structure of a semiconductor and retains its semiconducting properties in liquid form. It has a relatively high electronegativity (2.55 revised Pauling scale). Its reaction chemistry is mainly that of its nonmetallic anionic forms Se, SeO 3 and SeO 4.