P2S3 is a molecular compound. This is because it is composed of two non-metal elements, phosphorus and sulfur. When non-metal elements bond with each other, they typically form covalent bonds, which are bonds in which electrons are shared between atoms. Ionic bonds, on the other hand, are formed when one atom donates electrons to another atom, creating a positive and negative ion. Since P2S3 is composed of non-metal elements and forms covalent bonds, it is a molecular compound.