The platino-chlorides are reduced by hydrogen, and the caesium and rubidium chlorides extracted by water.
Lithia and fluorine are each present to the extent of about 5%; rubidium and caesium are sometimes present in small amounts.
Like caesium, it is precipitated with platinic chloride, and in the ordinary course of work would be weighed as potassium.
It led Bunsen himself almost immediately to the isolation of two new elements of the alkali group, caesium and rubidium.
The separation of caesium from the minerals which contain it is an exceedingly difficult and laborious process.
This residue consists of sodium, potassium and lithium chlorides, with small quantities of caesium and rubidium chlorides.
caesium sulphate, Cs2SO4, may be prepared by dissolving the hydroxide or carbonate in sulphuric acid.
also caesium, rare alkaline metal, 1861, coined by Bunsen and Kirchhoff in 1860 in Modern Latin (caesium), from Latin caesius "blue-gray" (especially of eyes), in reference to the two prominent blue lines in its spectrum, by which it was first identified.
cesium ce·si·um or cae·si·um (sē'zē-əm)
A soft ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells. Atomic number 55; atomic weight 132.905; melting point 28.4°C; boiling point 671°C; specific gravity 1.87; valence 1.
A soft, ductile, silvery-white element of the alkali group. It is liquid at room temperature and is the most reactive of all metals. Cesium is used to make photoelectric cells, electron tubes, and atomic clocks. Atomic number 55; atomic weight 132.905; melting point 28.5°C; boiling point 690°C; specific gravity 1.87; valence 1. See Periodic Table.