Answer:
disulfur tetroxide
Step-by-step explanation:
Since both sulfur (S) and oxygen (O) are nonmetals, the compound is covalent. In covalent compounds, the IUPAC name includes the names of both the elements. However, the element listed last (oxygen) needs the suffix -ide. Furthermore, there should be a prefix denoting the amount of each element. The subscripts give you these amounts.
As such, if there are 2 (di-) sulfur atoms and 4 (tetra-) oxygen atoms in the compound, the IUPAC name must be disulfur tetroxide.