The correct formula for nitrogen oxide, specifically nitrogen monoxide, is NO.
Nitrogen monoxide consists of one nitrogen atom and one oxygen atom. It is a colorless gas at room temperature and is commonly encountered in various chemical reactions, including combustion. The ‘N’ represents nitrogen, and the ‘O’ represents oxygen, combined to form a molecule of nitrogen monoxide. This compound plays a significant role in environmental chemistry and is a precursor to various pollutants in the atmosphere.