Chap 10 notes - which it is derived The charge on the...

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Rules for Naming Binary Ionic Compounds Containing a Metal Ion With a Variable Charge A binary ionic compound is composed of ions of two different elements - one of which is a metal, and the other a nonmetal. For example, iron(III) iodide, FeI 3 , is composed of iron ions, Fe 3+ (elemental iron is a metal), and iodide ions, I - (elemental iodine is a nonmetal). Rule 1. The positive ion (cation) is written first in the name; the negative ion (anion) is written second in the name. Rule 2. The name of the cation is the same as the name of the (neutral metal) element from
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Unformatted text preview: which it is derived. The charge on the cation is indicated using a Roman numeral, within parentheses, immediately following the name of the cation (e.g., Fe 3+ = "iron(III)", Fe 2+ = "iron(II)"). Rule 3. The anion is named by adding the suffix -ide to the root of the (nonmetal) element name (e.g., iod ine = I, " iod ide" = I-; sulf ur = S, " sulf ide" = S 2-). Note: Greek prefixes are not used to indicate the number of atoms of each element in the formula unit for the compound (e.g., FeI 3 is named "iron(III) iodide" not "iron(III) triiodide")....
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