Question 3.9: Naming Compounds When Their Formulas Are Given. Write accept......

Analyze

This task is generally easier than that of Example 3-8 because all you need to do is name the ions present.
However, you must recognize that copper forms two different ions and that the cation in Cu_{2}O  is  Cu^{2+} , copper(I).

Solve

Na_{2}S:  sodium sulfide

AlF_{3}:  aluminum fluoride

Cu_{2}O:  copper(I) oxide

Assess

Knowing when to use Roman numerals and when not to use them is a tricky aspect of naming ionic compounds. Because the metals of groups 1 and 2 have only one ionic form (one oxidation state), Roman numerals are not used in naming their compounds.