## Chemistry: The Science in Context (4th Edition)

In naming ionic compounds, we keep the name of the first element as-is and remove the last syllable of the second element and add $-ide$ to it. We do not add prefixes to any of the element names as is done for molecular compounds. For compounds that contain polyatomic ions, we refer to the table of polyatomic ions on page 60 of the textbook. The polyatomic ion's name does not change; just keep the name as-is. (a) sodium oxide (b) sodium sulfide (c) sodium sulfate (d) sodium nitrate (e) sodium nitrite