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The hydroxide moiety contains a oxygen-hydrogen bond, carrying a negative charge. Some of the inorganic hydroxides, like sodium hydroxide, calcium hydroxide, and other alkali hydroxides, are strong bases that are important industrial alkalis. Some of them, like hydroxides of zinc, aluminium, tin, beryllium, and lead, are amphoteric, as they act like both acids and bases. Salts of nitric acid containing the group NO3- are called nitrate salts. Nitrate anions form salts with a wide range of elements in the periodic table. Examples of nitrates are ammonium nitrate (NH4NO3), sodium nitrate (NaNO3) and potassium nitrate (KNO3). Nitrates consist of one central nitrogen atom surrounded by three identical oxygen atoms in a trigonal planar arrangement. Inorganic phosphorus is essential for every known form of life. Phosphorus forms many compounds such as metal phosphates, phosphides, oxides, halides, and oxyacids. As phosphates, they play a major role in biological molecules. The phosphorus containing compounds are mainly used as fertilizers. Phosphoric acid is the main source of phosphates used in detergents and other non-fertilizer applications. Many inorganic boron compounds are electron-deficient, which is what accounts for boron being a strong Lewis acid, accepting protons (H+ ions) in solution. Boron compounds include metal borates, boric acid, boric oxide, and boric acid esters. Borate salts produce basic solutions that are used in cleaning agents. Other boron compounds are used in a variety of things including adhesives, cement, disinfectants, fertilizers, fire retardants, glass, herbicides, metallurgical fluxes, and textile bleaches and dyes.