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     55    

55 Cs Caesium

Alkali metal, also named Cesium, mass: 132.90 u, 1 stable isotope (133), abundance rank (earth/space): 42/61

Click image to magnify. 1 gram caesium, five different photos of the same vial. Original size in cm: 0.5 x 4
Caesium 4 images Caesium
Caesium is the most chemically reactive of all metals, except for the almost non-existing francium. It spontaneously burns in air and explodes when dropped in water. The natural 133Cs isn't radioactive. Caesium is used in most atomic clocks, where a certain frequency of it is measured. In the body, caesium is stored in muscle tissue, like the chemically similar potassium.
When in the news, usually the radioactive and very dangerous 137Cs is meant. This is produced in nuclear power plants and has a half-life of 30 years. Some edible mushrooms, like the bay bolete, accumulate caesium.


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