What is the chemical symbol for ozone?

The chemical symbol for ozone is O3. Ozone is a molecule composed of three oxygen atoms, which distinguishes it from the more common diatomic oxygen molecule represented by the symbol O2, made up of only two oxygen atoms. This structure of three oxygen atoms gives ozone its unique properties, particularly its role in the Earth's upper atmosphere as a protective layer against harmful ultraviolet radiation. The other options do not accurately represent the molecular structure of ozone; for instance, O4 does not exist under normal atmospheric conditions. Therefore, O3 is the correct representation of ozone.