👉 Diphosphorus is a chemical element with symbol P and atomic number 18. It has the chemical formula P. Diphosphorus is often associated with the chemical compound phosphorus pentoxide, which is also known as phosphoric acid or ammonia. The name "diphosgene" comes from its ability to dissolve various materials such as glass, plastics, and metals. Diphosphorous can be found in a variety of forms, including pure diphosphorous gas (P