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Caesium periodic table11/11/2023 ![]() ![]() It is very radioactive and used as an industrial gamma ray source.Ĭaesium forms compounds with many other chemical elements. Another isotope, 137Cs is not made naturally but is made after nuclear fission has been done. 133Cs is used in atomic clocks, its vibration frequency used to define the length of the second. Therefore, the naturally-occurring isotope of caesium is 133Cs, which is not radioactive. Isotopes and compounds Ĭaesium has at least 39 known isotopes ranging in atomic mass from 112 to 151. They named this substance caesium, after the color blue. Because of these lines, they concluded that in addition to the elements already found, there must be another unknown substance in the mineral water. ![]() After they separated calcium, strontium, magnesium and lithium, they saw two lines in the "blue" range of the spectrum. They were testing mineral water, from Bad Dürkheim. In large amounts, its chemical compounds are mildly poisonous because it is close to potassium, which the body does need.Ĭaesium was first described in 1860, by Gustav Robert Kirchhoff and Robert Wilhelm Bunsen. Since there is little caesium on the Earth, it is rather expensive. Because of this, caesium is stored in mineral oil. It reacts more violently than the other alkali metals with water. It may set itself on fire (ignite) in air. Because of its high reactivity, it is a dangerous chemical. Its symbol is Cs.Ĭaesium is an alkali metal. Caesium (or cesium) is the chemical element with the atomic number 55 on the periodic table. ![]()
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