Phosphorus Halide
There are three series of binary phosphorus halides, containing phosphorus in the oxidation states +5, +3 and +2. All twelve compounds have been described, in varying degrees of detail, although serious doubts have been cast on the existence of PI5.
Read more about Phosphorus Halide: Oxidation State +5 (PX5), Oxidation State +3 (PX3), Oxidation State +2 (P2X4), Oxyhalides and Thiohalides