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caesium    
n. 铯[金属元素]

铯[金属元素]

caesium
n 1: a soft silver-white ductile metallic element (liquid at
normal temperatures); the most electropositive and alkaline
metal [synonym: {cesium}, {caesium}, {Cs}, {atomic number 55}]

caesium \caesium\, Caesium \C[ae]"si*um\(s[=e]"z[-e]*[u^]m), n.
[NL., from L. caesius bluish gray.] (Chem.)
A rare alkaline metal found in mineral water; -- so called
from the two characteristic blue lines in its spectrum. It
was the first element discovered by spectrum analysis, and is
the most strongly basic and electro-positive substance known.
Symbol Cs. Atomic number 55. Atomic weight 132.6.

Syn: cesium, Cs
[1913 Webster]

caesium
Symbol: Cs
Atomic number: 55
Atomic weight: 132.90545
Soft silvery-white metallic element belonging to group 1 of the periodic
table. One of the three metals which are liquid at room temperature.
Cs-133
is the natural, and only stable, isotope. Fifteen other radioisotopes
exist.
Caesium reacts explosively with cold water, and ice at temperatures
above
157K. Caesium hydroxide is the strongest base known. Caesium is the most
electropositive, most alkaline and has the least ionization potential of
all the elements. Known uses include the basis of atomic clocks,
catalyst
for the hydrogenation of some organic compounds, and in photoelectric
cells.
Caesium was discovered by Gustav Kirchoff and Robert Bunsen in Germany
in
1860 spectroscopically. Its identification was based upon the bright
blue
lines in its spectrum. The name comes from the latin word caesius, which
means sky blue. Caesium should be considered highly toxic. Some of the
radioisotopes are even more toxic.


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  • Caesium - Wikipedia
    It has only one stable isotope, caesium-133 Caesium is mined mostly from pollucite Caesium-137, a fission product, is extracted from waste produced by nuclear reactors It has the largest atomic radius of all elements whose radii have been measured or calculated, at about 260 picometres
  • Cesium | Description, Symbol, Uses, Facts | Britannica
    cesium chemical element Also known as: Cs, caesium Emeritus Professor of Chemistry, Michigan State University, East Lansing, Mich James L Dye
  • What Is Caesium Used For? From Clocks to Medicine
    Caesium is one of the most versatile elements on the periodic table, with uses ranging from defining how the world measures time to treating cancer and powering spacecraft Its unique physical properties, including the lowest ionization energy of any stable element and strong photoemissive behavior, make it irreplaceable in several high-precision technologies Defining the Second in Global
  • Caesium - Element information, properties and uses | Periodic Table
    Caesium gets its name from the Greek for heavenly blue Not for its eyes (it's only an element!) but less romantically for the appearance of its emission spectrum in the spectroscope
  • Cesium Facts - Caesium or Cs - Science Notes and Projects
    Cesium (or caesium) is a soft, shiny, pale gold metal with the chemical symbol Cs and atomic number 55 It is the most electropositive and least electronegative element using the Pauling scale
  • WebElements Periodic Table » Caesium » the essentials
    This WebElements periodic table page contains the essentials for the element caesium
  • Cesium - New World Encyclopedia
    Cesium (also spelled caesium, chemical symbol Cs, atomic number 55) is a member of the group of chemical elements known as alkali metals Soft and silvery gold in color, it is one of a handful of metals that liquefy near room temperature
  • Caesium - EniG. Periodic Table of the Elements
    Caesium was discovered by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff (DE) in 1860 The origin of the name comes from the Latin word caesius meaning sky blue or heavenly blue It is a very soft, light grey, ductile metal that reacts readily with oxygen and reacts explosively with water
  • Periodic Table of Elements: Los Alamos National Laboratory
    History From the Latin word caesius, sky blue Cesium was discovered spectroscopically in 1860 by Bunsen and Kirchhoff in mineral water from Durkheim Sources Cesium, an alkali metal, occurs in lepidolite, pollucte (a hydrated silicate of aluminum and cesium), and in other sources One of the world's richest sources of cesium is located at Bernic Lake, Manitoba The deposits are estimated to
  • Caesium - Periodic Table and Atomic Properties
    Caesium is a soft, silvery-gold alkali metal with a melting point of 28 5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature





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