1. Chapter 4.2 Ionic Compounds Naming/Formula Writing Single valent and multivalent metals

2. Rules – Ionic compounds are always METAL + NON-METAL 1. Name the metal. If the metal is multivalent, use a roman numeral in brackets after the metal name to indicate the charge of the ion. 1. Name the non-metal and change its ending to -ide

3. Examples – Name the following compounds LiCl Mg 3 P 2 AlN Na 2 S

4. Examples – Naming compounds with multivalent metals Fe 2 O 3 CuO MnO 3 NiS You must mathematically determine the charge on the metal

5. Writing the formula of an Ionic compound Rules 1. Write the symbol of the metal with its ion charge as a superscript 2. Write the symbol of the non-metal with its ion charge as a superscript 3. Criss cross the charges so that they become subscripts for the opposite element and remove + or – signs 4. Simplify the subscripts if possible.

6. Example of formula writing Potassium nitride Magnesium sulfide Gallium phosphide

7. Examples of formula writing Copper (II) sulfide Chromium (III) carbide Vanadium (IV) chloride

8. Homework Worksheet “Ionic compounds Naming and Formula Writing”