Cesium compounds are chemical substances that contain the element cesium, which is a soft, silvery-gold alkali metal. These compounds often include cesium chloride (CsCl), cesium carbonate (Cs2CO3), and cesium sulfate (Cs2SO4). They are known for their high solubility in water and are used in various applications, including in laboratories and in the production of atomic clocks. Cesium compounds are also important in the field of nuclear science and photovoltaics. For example, cesium formate is used in drilling fluids for oil extraction, while cesium vapor is utilized in atomic clocks due to its precise timekeeping properties.