Answer
NO - Nitrogen Monoxide
Work Step by Step
1. First, begin by writing the name of the first element. N -Nitrogen
2. Since, NO is a molecular compound (two non-metals joined together), we have to use the appropriate prefix for the second element.
3. Note that the second element , oxygen, has just one atom. This means we have to use the prefix "mono" and change oxygen's ending to oxide.
4. Combine the two names to get: $$Nitrogen Monoxide$$