Names compounds involving single-cation metals

Naming Compounds Involving Single-Cation Metals... 

Each category of metals requires a different scheme for naming their compounds. You start by learning to name ionic compounds involving metals that only form only a single cation. 

In the ionic compounds considered previously (Type I), the metal involved forms only a single type of cation. That is, sodium forms only Na", calcium forms only Ca, and so on. However, as we will see in more detail later in the text, many metals can form more than one type of positive ion and thus form more than one type of ionic compound with a given anion. For example, the compound FeCli contains Fe " ions, and the compound FeCla contains Fe " ions. In cases such as these, the charge on the metal ion must be specified. The systematic names for these two iron compounds are iron(II) chloride and iron(III) chloride, respectively, where the Roman numeral indicates the charge of the cation. 

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