cesium /ce·si·um/ (Cs) (se´ze-um) a chemical element, at. no. 55.
cesium (Cs)
cesium (sē´zē
m),
ce·si·um or cae·si·um (s  z- m)n. Symbol Cs A soft ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells. Atomic number 55. |
cesium (Cs)
[sē′zē·əm]
Etymology: L, caesius, sky blue
an alkali metal element. Its atomic number is 55; its atomic mass is 132.9. Like other alkali metals, cesium emits electrons when exposed to visible light and is used in photoelectric cells and in television cameras. Also spelled caesium.
cesium (sē´zē
m),n an alkali metal element used in photoelectric cells and television cameras.
cesium
a chemical element, atomic number 55, atomic weight 132.905, symbol Cs. See Table 6.
cesium-137
a product of atomic fission by explosion or breakdown of a reactor. It is feared as a pollutant because of its very long half-life.
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