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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 - Image Compressor
    Caesium is a free software developed for simplicity and effectiveness Caesium is one of the most popular image optimization software available helping photographers, bloggers, webmasters, businesses or casual users at storing, sending and sharing digital pictures
  • Cesium | Description, Symbol, Uses, Facts | Britannica
    cesium (Cs), chemical element of Group 1 (also called Group Ia) of the periodic table, the alkali metal group, and the first element to be discovered spectroscopically (1860), by German scientists Robert Bunsen and Gustav Kirchhoff, who named it for the unique blue lines of its spectrum (Latin caesius, “sky-blue”) This silvery metal with a golden cast is the most reactive and one of the
  • Caesium - Element information, properties and uses | Periodic Table
    Caesium was almost discovered by Carl Plattner in 1846 when he investigated the mineral pollucite (caesium aluminium silicate) He could only account for 93% of the elements it contained, but then ran out of material to analyse (It was later realised that he mistook the caesium for sodium and potassium )
  • Caesium | Cesium History, Uses, Facts, Physical Chemical Characteristics
    Caesium compounds with chlorides are used in photoelectric cells Caesium is used in industries as a catalyst promoter Caesium nitrate is used to make optical glasses Caesium is widely used in the production of electricity, electronics and in chemistry Caesium is also used in the manufacturing of infrared lamps Caesium is widely used in clocks
  • Cesium Facts, Symbol, Discovery, Properties, Uses - Chemistry Learner
    Cesium (pronounced as SEE-zee-em), sometimes spelled as caesium, is a highly reactive metal when exposed to air and water Denoted by the chemical symbol Cs, it belongs to the family of alkali metals [1] It has one naturally occurring isotope, Cs-133 while the rest thirty-five are unstable
  • Caesium - Simple English Wikipedia, the free encyclopedia
    Caesium (or cesium) is the chemical element with the atomic number 55 on the periodic table Its symbol is Cs Caesium is an alkali metal Its melting point is low (28 °C) It is extremely reactive Because of its high reactivity, it is a dangerous chemical It may set itself on fire (ignite) in air It explodes on contact with water
  • Where Is Caesium Found? | Discover Its Sources - wellwisp. com
    The most notable sources of caesium come from specific locations around the globe Main Sources of Caesium The primary commercial sources of caesium include: 1 Pollucite: This mineral is a hydrated caesium aluminum silicate and is considered one of the most important sources of caesium It predominantly occurs in granitic pegmatites
  • Cesium Facts – Caesium or Cs - Science Notes and Projects
    Cesium or caesium is an alkali metal with atomic number 55 and element symbol Cs Cesium or caesium is a shiny, pale gold metal with element symbol Cs and atomic number 55 Cesium is the softest metal that is a solid at room temperature It becomes a liquid element at 28 5 °C or 83 3 °F Like gallium, it is a metal you can melt in the palm of your hand (but please don’t)
  • Caesium - WikiChem - Potsdam
    Caesium is highly pyrophoric and ignites spontaneously in air to form caesium hydroxide and various oxides Caesium hydroxide is an extremely strong base, and can etch glass Caesium compounds are rarely encountered by most persons All caesium compounds should be regarded as mildly toxic because of its chemical similarity to potassium
  • Caesium (Cs) [55] — Chemical Element — Periodic Table - ChemGlobe
    Get the facts about element Caesium (Cs) [55] from the periodic table Find physical data, electron configuration, chemical properties, aggregation states, isotope data (including decay trees) as well as some historic information





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