Final answer:
The formula for Diphosphorus triselenide is P2Se3. It consists of two phosphorus atoms bonded to three selenium atoms.
Step-by-step explanation:
The formula for Diphosphorus triselenide is P2Se3. It consists of two phosphorus atoms bonded to three selenium atoms. In this compound, phosphorus has an oxidation state of +3 and selenium has an oxidation state of -2. The formula indicates that there are two phosphorus atoms and three selenium atoms present in the compound.