Niobium, a lustrous, silver-white, metallic chemical element. Until 1950, when the name niobium was officially adopted by the International Union of Pure and Applied Chemistry, the metal was also known as columbium in the United States.
Chemical elements are substances composed of only one type of atom and they cannot be broken down further. Chemical elements are the simplest forms of matter and each one is assigned a specific atomic number. Check out these articles on chemical elements.