Metals combine with nonmetals to give ionic compounds. When naming binary ionic compounds, name the cation first (specifying the charge, if necessary), then the nonmetal anion (element stem + -ide).
Port authority. For other uses, see Port authority (disambiguation). In Canada and the United States, port authority (less commonly a port district) is a governmental or quasi-governmental public authority for a special-purpose district usually formed by a legislative body (or bodies) to operate ports and other transportation infrastructure. Most port authorities are financially self-supporting.
OilTankers Oil Tankers. Tanker safety - preventing accidental pollution. IMO's major function is to make shipping of all types safer, including tankers. The measures incorporated in the numerous safety conventions and recommendations apply to these as well as other ships - and the safer a ship is, the less likely it is to be involved in an accident.