# Chapter 2 - Atoms, Molecules, and Ions - Questions and Exercises - Questions - Page 83: 2.19

To name a molecular compound, we would keep the first element's name as-is and only add a prefix if there is more than one atom of that element in the compound. For the second element in the compound, we add a prefix reflecting how many atoms of that element is present in the compound. Nitrogen oxide, therefore, would not be a valid name for NO because the nitrogen part would be correct but the oxide should have a prefix of $mono-$ to denote that there is only one oxygen atom in this compound. The "correct" name for this compound should be "nitrogen monoxide."

#### Work Step by Step

To name a molecular compound, we would keep the first element's name as-is and only add a prefix if there is more than one atom of that element in the compound. For the second element in the compound, we add a prefix reflecting how many atoms of that element is present in the compound. Nitrogen oxide, therefore, would not be a valid name for NO because the nitrogen part would be correct but the oxide should have a prefix of $mono-$ to denote that there is only one oxygen atom in this compound. The "correct" name for this compound should be "nitrogen monoxide."

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