The Element Cesium
 

Cesium / Caesium - Element Properties and Periodic Table Info


Cesium - An element from the Periodic Table based on the IOUPAC 1985 standard

Chemical Elements

Periodic Table

Spelling of the Element
Caesium spelt as Cesium in the USA

Definition of the Cesium Element
A soft, silvery-white ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells and to catalyze hydrogenation of some organic compounds.

Origin / Meaning of the name Cesium
The word Caesium originates from the Latin word 'caesius' which means "sky blue" from the bright blue lines in its spectrum.

 

Classification of the Cesium Element
Cesium
is classified as an "Alkali Metal" and located in Group 1 elements of the Periodic Table. An Element classified as an Alkali Metal is a very reactive metal that does not occur freely in nature. Alkali metals are soft, malleable, ductile, and are good conductors of heat and electricity.

Facts about the History of the Cesium Element
Cesium was discovered by Fustov Kirchoff and Robert Bunsen in 1860 from mineral water found in Dürkheim, Germany. It was the first element discovered by spectrum analysis.

Occurrence the Cesium Element
Obtained from pollucite and lepidolite

Associated Uses of Cesium
Atomic clocks
Removes air traces in vacuum tubes
Ion propulsion systems
Medical
Photoelectric cells
Cesium vapor
Magnetometer

The Properties of the Cesium Element
Name of Element : Cesium
Symbol of Element : Cs
Atomic Number of Cesium : 55
Atomic Mass: 132.90546 amu
Melting Point: 28.5 °C - 301.65 °K
Boiling Point: 678.4 °C - 951.55005 °K
Number of Protons/Electrons in Cesium : 55
Number of Neutrons in Cesium : 78
Crystal Structure: Cubic
Density @ 293 K: 1.873 g/cm3
Color of Cesium :
silvery-white

Cesium and the Periodic Table
Check out Cesium on the Periodic Table which arranges each chemical element according to its atomic number, as based on the periodic law, so that chemical elements with similar properties are in the same column. Our Periodic Table is simple to use - just click on the symbol for Cesium for additional information and for an instant comparison of the Atomic Weight, Melting Point, Boiling Point and Mass - G/cc with any other element. An invaluable source of facts and information as a Chemistry reference guide.

Cesium - IUPAC and the Modern Standardised Periodic Table
The Standardised Periodic Table in use today was agreed by the International Union of Pure Applied Chemistry, IUPAC, in 1985 and now recognises more periods and elements than Dimitri  Mendeleev knew in his day but still all fitting into his concept of  the "Periodic Table" in which Cesium is just one element that can be found.
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Online Science Quiz
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Learn about Cesium and have some Fun!
The Free Online Science Quiz contains many questions relating to Cesium and each additional element - group, classification, properties and atomic number.

The Element Cesium

The Elements are the building blocks of Modern Science and Chemistry



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