An inorganic compound containing one atom of phosphorous and three atoms of oxygen in the form of the ion?

Answer 1

There are none. The phosphite ion PO33- ion is theoretical. When you try to form compounds containing it you actually get HPO32- where the H atom is bonded directly to phosphorus. Historically these compounds are confusingly called phosphites, and the modern name is phosphonate.

Answer 2

The inorganic compound containing one phosphorus atom and three oxygen atoms in the form of an ion is called a phosphate ion, which is represented as PO4^3-. This ion is commonly found in compounds such as phosphates, which are essential in various biological processes, including DNA and RNA synthesis and energy transfer in cells.