Final answer:
Diphosphorus pentaselenide is the name of the compound with the formula P2Se5, following standard chemical nomenclature conventions where prefixes indicate the number of atoms.
Step-by-step explanation:
The name of the compound with the formula P2Se5 is diphosphorus pentaselenide. This naming follows the convention where the prefix 'di-' indicates the presence of two phosphorus atoms, and 'penta-' indicates there are five selenium atoms.
The name is derived by first stating the quantity and base name of the first element in the formula (in this case diphosphorus), and then the quantity and base name of the second element (pentaselenide), with the ending of the second element's name altered to '-ide' to indicate it is an anion.
Thhe complete question is: Enter the name of the compound whose formula is p2se5