Definitions for caesium
ˈsi zi əmcae·sium

Princeton's WordNetRate this definition:0.0 / 0 votes

1. cesium, caesium, Cs, atomic number 55noun

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

WiktionaryRate this definition:0.0 / 0 votes

1. caesiumnoun

   A metallic chemical element (symbol Cs) with an atomic number of 55.

2. Etymology: caesius, in reference to the radiation spectra + -ium

WikipediaRate this definition:0.0 / 0 votes

1. Caesium

   Caesium (IUPAC spelling) (or cesium in American English) is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium has physical and chemical properties similar to those of rubidium and potassium. It is pyrophoric and reacts with water even at −116 °C (−177 °F). It is the least electronegative element, with a value of 0.79 on the Pauling scale. It has only one stable isotope, caesium-133. Caesium is mined mostly from pollucite. The element has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes. Caesium-137, a fission product, is extracted from waste produced by nuclear reactors. The German chemist Robert Bunsen and physicist Gustav Kirchhoff discovered caesium in 1860 by the newly developed method of flame spectroscopy. The first small-scale applications for caesium were as a "getter" in vacuum tubes and in photoelectric cells. In 1967, acting on Einstein's proof that the speed of light is the most-constant dimension in the universe, the International System of Units used two specific wave counts from an emission spectrum of caesium-133 to co-define the second and the metre. Since then, caesium has been widely used in highly accurate atomic clocks. Since the 1990s, the largest application of the element has been as caesium formate for drilling fluids, but it has a range of applications in the production of electricity, in electronics, and in chemistry. The radioactive isotope caesium-137 has a half-life of about 30 years and is used in medical applications, industrial gauges, and hydrology. Nonradioactive caesium compounds are only mildly toxic, but the pure metal's tendency to react explosively with water means that caesium is considered a hazardous material, and the radioisotopes present a significant health and ecological hazard in the environment.

ChatGPTRate this definition:0.0 / 0 votes

1. caesium

   Caesium, also spelled as cesium, is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal that is highly reactive and is liquid at near room temperature. Caesium is most commonly used in atomic clocks and as a catalyst in the hydrogenation of certain organic compounds.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Caesiumnoun

   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 weight 132.6

WikidataRate this definition:0.0 / 0 votes

1. Caesium

   Caesium or cesium is a chemical element with symbol Cs and atomic number 55. It is a soft, silvery-gold alkali metal with a melting point of 28 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium is an alkali metal and has physical and chemical properties similar to those of rubidium and potassium. The metal is extremely reactive and pyrophoric, reacting with water even at −116 °C. It is the least electronegative element having a stable isotope, caesium-133. Caesium is mined mostly from pollucite, while the radioisotopes, especially caesium-137, a fission product, are extracted from waste produced by nuclear reactors. Two German chemists, Robert Bunsen and Gustav Kirchhoff, discovered caesium in 1860 by the newly developed method of flame spectroscopy. The first small-scale applications for caesium were as a "getter" in vacuum tubes and in photoelectric cells. In 1967, a specific frequency from the emission spectrum of caesium-133 was chosen to be used in the definition of the second by the International System of Units. Since then, caesium has been widely used in atomic clocks. Since the 1990s, the largest application of the element has been as caesium formate for drilling fluids. It has a range of applications in the production of electricity, in electronics, and in chemistry. The radioactive isotope caesium-137 has a half-life of about 30 years and is used in medical applications, industrial gauges, and hydrology. Although the element is only mildly toxic, it is a hazardous material as a metal and its radioisotopes present a high health risk if released into the environment.

Matched Categories

1. • Metallic Element

Anagrams for caesium »

1. aeciums

2. æciums

How to pronounce caesium?

1. Alex

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   David

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   Mark

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   Daniel

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   Libby

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   Mia

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   Karen

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How to say caesium in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of caesium in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of caesium in Pythagorean Numerology is: 8

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=caesium
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Caesium
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Caesium
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/caesium
6. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=caesium