- Cesium was discovered by Robert Bunsen and Gustar Kirchoff in 1860. From Latin word caesius (mean- Sky blue).
- Cesium metal is extremely reactive.
- Cesium is the least electronegative element with a stable isotopes.
- Cesium is found in the minerals pollucite and lepidolite.
- Cesium form alloy with other alkali metals and amalgam with gold.
Atomic number - 55
Number of electrons - 2, 8, 18, 18, 8, 1
Electronic configuration - [ Xenon ] 6s1
Boiling point - 944 K
Atomic weight - 132.905
- Cesium is used in photoelectric cells, vaccum tubes and IR lams.
- Cesium is used in atomic clocks.
- Cesium hydroxide is used in etch silicon.
- It is used as a catalyst in the hydrogenation of few organic compounds.
- Cesium vapour is used in many common magnetometers.
- It is also used in chemical and medical uses.
- Cs-137 is a radioisotope used as a gamma emitter in industrial application.
- Cs-137 is also used in hydrologic studies.
- Cesium nitrate is used as an oxidizer and pyrotechnic colorants, to burn silicon in infrared flares.