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caesium

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

caesium (symbol Cs) Rare silvery-white metallic element in group I of the periodic table; the most alkaline and electropositive element. Discovered in 1860 by German chemist Robert Bunsen and German physicist Gustav Kirchhoff, caesium is ductile and used commercially in photoelectric cells. The isotope Cs137 is used in cancer treatments. The decay rate of its most common isotope Cs133 is the standard for measuring time. Properties: at.no. 55; r.a.m. 132.9055; r.d. 1.87; m.p. 28.4°C (83.1°F); b.p. 678°C (1252.4°F). See also alkali metals; atomic clock

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