sentence: Sodium phosphide is an example.
sentences_before: Phosphide' is an ion. It does not always have that formula. It is a reducing agent.
sentences_after: Some phosphides are semiconductors and are not ionic with P3- ions. They are less reactive. Some metals form alloys with phosphorus to make phosphides. If it is ionic, then the phosphorus is in the -3 oxidation state.
concept_name: sodium
headings: Phosphide
categories: Phosphorus compounds