Definition of caesium Caesium

cae•si•um

We found 5 definitions of caesium from 5 different sources.

What does caesium mean?

Noun
caesium - a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
		cesium, Cs, atomic number 55
		metallic element, metal any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
		pollucite a rare mineral that is an important source of cesium

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caesium (Noun)
A metallic chemical element symbol Cs with an atomic number of 55.

caesium (n.)
A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic weight 132.6.

Caesium (or cesium) is chemical element 55 on the periodic table. Its symbol is Cs.

Caesium is an alkali metal. It has some interesting properties. It can melt when you hold it in your hand, but it would not be smart to hold pure caesium in your hand because it is extremely reactive. It will even explode in air. There is not much caesium available on the Earth, so it costs a lot of money to buy it.

Caesium forms compounds with many other chemical elements. Because of this, it is used in tubes without air because caesium will react with the air. Otherwise, caesium does not have too many uses. One form of caesium, caesium-137 (how many protons and neutrons there are in an atom of that type of caesium), is used in atomic clocks.

The human body does not need caesium, and it may be dangerous because it acts like other important things our bodies need, like sodium and potassium.