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Cesium (Cs) is the sixth element in Group IA of the periodic table. It has an atomic number of 55, an atomic weight of 132.90, and a valence of 1. The average abundance of Cs in the earth’s crust is 2.6 ppm; in soils it is 1 to 5 ppm; in streams it is 0.02 mg/L; and in groundwaters it is generally <0.1 mg/L. Cesium is found in lepidolite and in the water of certain mineral springs. Cs, with a 33-year half-life, is widely dispersed on the earth’s surface as a result of the radioactive fallout from the atmospheric testing of nuclear weapons. Cesium compounds are used in photoelectric cells, as a catalyst, and in brewing. Some cesium compounds are fire hazards...