## Chemistry: An Atoms-Focused Approach

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