4 Naming Ionic Compounds Continued Name to formula: Determine the charge on the cation Determine the charge on the anion Determine the ratio of cations to anions needed to make the compound neutral Always express the ratio of cations to anions in the simplest whole number ratio Examples: Lithium fluoride is composed of Li + and F - ; this forms the compound LiF Magnesium bromide is composed of Mg 2+ and Br - ; this forms the compound MgBr 2 Aluminum chloride is composed of Al 3+ and Cl - ; this forms the compound AlCl 3 Problems: Magnesium oxide Potassium iodide Tin (II) oxide
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