What does P2O3 stand for?

The name P2O3 corresponds to a chemical compound made of phosphorus and oxygen. In this compound, there are two phosphorus atoms and three oxygen atoms. To accurately name this compound according to IUPAC nomenclature rules, we focus on the prefixes that indicate the number of each type of atom.

The prefix "di-" is used to denote the presence of two phosphorus atoms, and "tri-" is used for three oxygen atoms. Therefore, the correct naming is "diphosphorous trioxide." This name reflects the specific quantities of both elements in the formula.

The other options do not apply to the formula P2O3 for various reasons, primarily focusing on incorrect use of prefixes or incorrect elements entirely.

In summary, diphosphorous trioxide is the accurate representation of the formula P2O3, highlighting both the quantity and elements present in the compound.