Products: P series
| Compound | Formula |
| Phosphorus (II) iodide | P2I4 |
| Phosphorus (V) nitride | P3N5 |
| Phosphorus (III) selenide | P2Se3 |
| Phosphorus (V) selenide | P2Se5 |
| Phosphorus (III) sulfide | P2S3 |
| Phosphorus (III) telluride | P2Te3 |
| Potassium ethoxide | KC2H5O |
| Potassium fluostannate, hydrate | K2SnF4·H2O |
| Potassium orthomolybdate | K2MoO4 |
| Potassium nitrosodisulfonate(Fremys salt) | (KSO3)2NO |
| Potassium selenate | K2SeO4 |
| Potassium selenite | K2SeO3 |
| Potassium selenocyanate | KSeCN |
| Potassium tantalate | KTaO3 |
| Potassium tellurate | K2TeO4 |
| Potassium tellurite | K2TeO3 |
| Potassium thiomolybdate | K2MoS4 |
| Potassium metatitanate | K2TiO3 |
| Potassium orthovanadate | K2VO4 |
| Potassium metazirconate | K2ZrO3 |
| Praseodymium Compounds (see Rare Earth compounds) |
