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.
An image of the old port of Kolkata. Following the shift of power from the company to the British crown, a port commission was set up in 1870. Though the port was conceived to be a commercial port and gateway of eastern India, the port played a very important role in the Second World War.