The ion S²⁻, known as the sulfide ion, consists of a sulfur atom that has gained two extra electrons. This gives it a negative charge of two, making it an anion. Sulfide ions are commonly found in various compounds, such as metal sulfides, where they bond with metals to form minerals. Sulfide ions play a significant role in nature and industry. They are involved in processes like the formation of sulfide minerals and can be found in volcanic gases. Additionally, sulfides are important in the production of sulfuric acid, a key chemical in many industrial applications.