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

Naming Compounds When Their Formulas Are Given

Write acceptable names for the compounds Na_{2}S, AlF_{3}, Cu_{2}O.

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^{+}, copper(I).

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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.

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Question: 3.12

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(a) The molecular formula of the first compound is...