Chalcogenides are compounds that contain one or more chalcogen elements, which include sulfur, selenium, tellurium, and polonium. These elements are found in group 16 of the periodic table and are known for their diverse chemical properties. Chalcogenides can form various types of compounds, including oxides, sulfides, and selenides, and are often used in materials science and semiconductor applications. Many chalcogenides exhibit interesting electrical and optical properties, making them valuable in technology. For example, cadmium sulfide is a well-known chalcogenide used in solar cells, while tin selenide is studied for its potential in thermoelectric devices. Their unique characteristics continue to be explored for advancements in electronics and energy solutions.