Type I & II Binary Compounds

What are Type I & II Binary Compounds?

     Type I & II binary compounds are compounds made of a metal (the cation) and a nonmetal (the anion). The cation is positively charged and the anion is negatively charged. The metal in a type I compound has a constant charge, and is usually found in one of the first two groups of the periodic table. The metal in a type II compound does does not have a constant charge, and is called a transition metal.

How do I name Type I & II Binary Compounds?

     To name a type I binary compound, you simply write the name of the metal present, then write the name of the nonmetal, replacing the ending with -ide.

Ex: CsF -> Cesium Fluoride; AlCl₃ -> Aluminum Chloride

     To name a type II binary compound, you go through the same process as you would with a type I binary compound, but you will add the charge of the cation in parentheses, using roman numerals, after the name of the metal.

Ex: CuCl -> Copper (I) Chloride; Fe₂O₃ -> Iron (III) Oxide