What is the chemical name for nitrogen dioxide?

The chemical name for nitrogen dioxide is indeed accurately represented by the formula NO2. This compound consists of one nitrogen atom and two oxygen atoms. The "di-" prefix in "dioxide" indicates that there are two oxygen atoms present.

In nomenclature, compounds are typically named based on the number of each type of atom they contain. Nitrogen (N) is the central atom with a single oxygen atom bonded to it, and the additional oxygen atom accounts for the "di-" prefix. Therefore, nitrogen dioxide correctly reflects both the elements involved and the quantities of each element.

The other formulas listed in the options represent different compounds: NO refers to nitrogen monoxide, SO2 refers to sulfur dioxide, and SO3 refers to sulfur trioxide. Each of these has a different composition and name, emphasizing the importance of correctly indicating the types and numbers of atoms in chemical nomenclature.