|Group||1||Melting point||28.5°C, 83.3°F, 301.7 K|
|Period||6||Boiling point||671°C, 1240°F, 944 K|
|Block||s||Density (g cm−3)||1.873|
|Atomic number||55||Relative atomic mass||132.905|
|State at 20°C||Solid||Key isotopes||133Cs|
|Electron configuration||[Xe] 6s1||CAS number||7440-46-2|
|ChemSpider ID||4510778||ChemSpider is a free chemical structure database.|
- Cesium (Cs) is a chemical element in the periodic table with atomic number 55 discovered by Fustov Kirchhoff and Robert Bunsen in the year 1860.
- The name is derived from a Latin word Caesius which means sky blue, as it burns with a blue flame.
- Cesium formate-based drilling fluids are extensively used in extractive oil industry.
- It is used in thermionic generators which convert heat energy to electrical energy.
- As the density of cesium is very high, cesium chloride, cesium sulphate are widely used in molecular biology.
- Cesium is used in manufacturing optical glasses and other optical instruments. It is used to remove oxygen from light bulbs and vacuum tubes.
- A special application of cesium is that it is used in the manufacturing of most accurate atomic clock. It is also called as cesium clock.
- It is a soft, silvery-gold alkali element that is quickly attacked by air and reacts explosively with water.
- It is a very rare element and estimated that only 3 parts per million are available in the Earth’s Crust.
- It is found in minerals like pollucite and lepidolite. It occurs in environment mainly due to erosion and withering of rocks.
- Cesium has no biological importance and is not harmful to life.
- When contact with radioactive cesium occurs, which hardly happens, a person may experience cell damage due to radiation.