Arsenide

An arsenide (compound) is a compound with arsenic in oxidation state −3, but the term is used loosely. The mineral sperrylite (PtAs₂) is called a platinum arsenide, but the formal oxidation state for arsenic is −2. because the solid is usually described as Pt4+,As₂4-. The description of gallium arsenide (GaAs) is more straightforward since it features isolated arsenic centers.