Selenium shows borderline metalloid or nonmetal behaviour. The nonmetal binary fluorides are volatile compounds. Alkaline earth metals reduce the nonmetal from its oxide. An anion is a negatively charged ion or a nonmetal. Most of the chemistry of antimony is characteristic of a nonmetal. Most of the chemistry of tellurium is characteristic of a nonmetal. As a halogen, astatine tends to be classified as a nonmetal. In 1950 astatine was described as a halogen and (therefore) a reactive nonmetal. "Sulfur" (symbol S) is an abundant multivalent nonmetal, one of chalcogens. Boron is a special case, being the only nonmetal in group 13. Bromine is the third halogen, being a nonmetal in group 17 of the periodic table. In light woven industry, HEDP is used as detergent for metal and nonmetal. Most of the chemistry of germanium is characteristic of a nonmetal. Broadly, any element lacking a preponderance of metallic properties can be regarded as a nonmetal. Bromine (), the only liquid nonmetal at room temperature, is explained in the following section.