Cesium meaning

sēzē-əm
A soft, silvery-white ductile, metallic element that is the most electropositive and alkaline of the elements and is used in atomic clocks and photoelectric cells and to catalyze hydrogenation of some organic compounds. The fundamental unit of time in the International System, the second, is based on the frequency of radiation between two energy states in an atom of the Cs-133 isotope. Atomic number 55; atomic weight 132.905; melting point 28.44°C; boiling point 671°C; specific gravity 1.873; valence 1.
noun
0
0
A soft, silver-white, ductile, metallic chemical element, one of the alkali metals and the most electropositive of all the elements: it ignites in air, reacts vigorously with water, and is used in photoelectric cells: symbol, Cs; at. no. 55: a radioactive isotope (cesium-137) with a half-life of 30.17 years is produced by fission and is used in cancer research, radiation therapy, etc.
noun
0
0
A soft, ductile, silvery-white element of the alkali group. It is liquid at room temperature and is the most reactive of all metals. Cesium is used to make photoelectric cells, electron tubes, and atomic clocks. Atomic number 55; atomic weight 132.905; melting point 28.5°C; boiling point 690°C; specific gravity 1.87; valence 1.
0
0
(US) Alternative spelling of caesium.
noun
0
0
Advertisement

Origin of cesium

  • From Latin caesius bluish gray (from its blue spectral lines)

    From American Heritage Dictionary of the English Language, 5th Edition