## Chemistry: An Atoms-Focused Approach

(a) sodium oxide This compound is a simple binary ionic compound. To name this compound, we name the first compound using its full name (sodium). Then we add the second element (oxygen), changing its ending to $-ide$. (b) sodium sulfide This compound is a simple binary ionic compound. To name this compound, we name the first compound using its full name (sodium). Then we add the second element (sulfur), changing its ending to $-ide$. (c) sodium sulfate This compound is a compound containing an oxoanion. To name this compound, we name the first compound using its full name (sodium). Then we add the second portion, which is the oxoanion sulfate. There is no need to change the ending here. (d) sodium nitrate This compound is a compound containing an oxoanion. To name this compound, we name the first compound using its full name (sodium). Then we add the second portion, which is the oxoanion nitrate. There is no need to change the ending here. (e) sodium nitrite This compound is a compound containing an oxoanion. To name this compound, we name the first compound using its full name (sodium). Then we add the second portion, which is the oxoanion nitrite. There is no need to change the ending here.