The name comes from the latin word, caesius, which means sky blue. Caesium is attacked by oxygen, and very explosively when in contact with water and ice in temperatures above 116K.When it reacts with water, hydrogen gas is released therefore making it very flammable as a result of this reaction.Caesium reacts very quickly therefore needs to be kept in dry,still atmosphere or in oil. A metallic element that belongs to group 1 of the periodic table.
One of the three metals which are in the state of liquid at room temperature. Caesium should be considered highly toxic. Caesium is found in the Earth’s crust. It is used in the industry as a catalyst promoter to make special glass, and in radiation monitoring equipment; also in atomic clocks. Caesium was discovered by Robert Bunsen and Gustav Kirchoff in 1860 in mineral water. Caesium was the first element discovered by spectrum analysis, based upon the bright lines in its spectrum.