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The Element Cesium


"The Atom"

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. Cesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C. Tiny quantities of cesium chloride are found in mineral springs and in seawater. The Atomic Number of this element is 55 and the Element Symbol is Cs.

The Properties of the Cesium Element
Symbol of Element : Cs
Atomic Number : 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 : 55
Number of Neutrons: 78
Crystal Structure: Cubic
Density @ 293 K: 1.873 g/cm3
Color: silvery-white

Spelling of the Element
Cesium is spelt as Caesium in the UK

What is Cesium? 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.

What is Cesium? Periodic Table Group and Classification of the Cesium Element
Elements can be classified based on their physical states (States of Matter) e.g. gas, solid or liquid. This element is a solid. 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. Nearly 75% of all the elements in the Periodic Table are classified as metals which are detailed in the List of Metals.

What is Cesium? Occurrence of the Cesium Element
Cesium is found in the mineral pollux, or pollucite, which occurs on the island of Elba, in South Africa, in the United States in Maine and South Dakota, and in Manitoba, Canada.

Abundances of the element in different environments
% in Universe 8×10-8%
% in Sun 8×10-7%
% in Meteorites 0.000014%
% in Earth's Crust 0.00019%
% in Oceans 5×10-8%
% in Humans 2×10-6%

Medical Uses of Cesium - Health and Treatments
Interesting information on the Medical Uses of Cesium, Health and Treatments. Radium salts have been used as radiation sources in the treatment of cancer but are gradually being replaced in such therapy by cobalt and cesium.

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

Facts about the History of the Discovery of 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.

Robert Wilhelm Bunsen
Robert Wilhelm Bunsen (1811-1899) invented many lecture-room and laboratory appliances, most famously the Bunsen burner. He also invented the spectroscope and with it discovered rubidium and caesium; greatly perfected methods of electrolysis, inventing a new battery; made many investigations among metallic and organic substances.

Site Index
States of Matter
Alkali Metals
List of Metals
Periodic Symbol
Periodic Table

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