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Nomenclature%20Packet - Rules of Nomenclature for Binary...

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Rules of Nomenclature for Binary Compounds There are three types of binary compounds: Type I. A metal of fixed charge and a nonmetal; Type II . A metal of variable charge and a nonmetal; and Type III . Two nonmetals Metals of ‘variable charge’ tend to be transition elements with some exceptions; metals of fixed charge tend to be the alkali metals and the alkaline earths, along with zinc, cadmium and silver. Nonmetals are those compounds to the right of the bold zig-zag line (see Periodic Table attached) The rules for naming binary compounds are then as follows: Rule 1 . When writing a formula or naming a compound: a). For Type I and Type II compounds, first list the metal then the nonmetal; b) For Type III compounds always list the electropositive species first (the element furthest left in the periodic table) and then the electronegative species. Type III species tend to be exclusively covalently bound compounds. NOTE: It becomes very important that you KNOW YOUR IONS AND THEIR CHARGES (especially the anions, since any given element anion does not have varying charges)!!! Rule 2 . All compound must be neutral UNLESS indicated otherwise. Rule 3. When naming binary compounds: a). For compounds of Type I and Type II , always use the FULL name of the metal and add the suffix -ide to the root name of the nonmetal (i.e. Metal Nonmetide); b). Type II
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