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n. A soft, silvery-white ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells and to catalyze hydrogenation of some organic compounds. Atomic number 55; atomic weight 132.905; melting point 28.5°C; boiling point 690°C; specific gravity 1.87; valence 1. See Table at element.

n. Alternative spelling of caesium.

n. the chemical element of atomic number 55. It is a univalent element, the most electropositive metal. Symbol Cs; atomic weight 132.905. IT has a melting point of 28.4° C.

n. a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal

""It stands to reason that at some point the Ukrainian government would like to be able to use that land again, but the scientists have calculated that what they call cesium's" ecological half-life "- the time for half the cesium to disappear from the local environment - is between"

metallic element    metal   

cesium 137   

caesium    Cs   

magnesium   

rubidium    strontium    perchlorate    mercuric    lithium    periodate    chlorate    nitronium    thallium    magnesium