The Periodic Table/55 - Caesium (Cs)

Element Caesium (Cs, 55)

Here you can read more about the chemical element Caesium. Its shemical symbol is Cs and its atomic number is 55. The relative atomic mass of Caesium is 132.9054519 u. The elemental classification of Caesium is Alkali metals, and it belongs to group 1 and period 6 in the Periodic Table of Elements.

The density of Caesium is 1879 kg/m3. And the mineral hardness of Caesium is 0.2 Mohs. The melting point of Caesium is 301.6 Kelvin (28.6 ℃). The boiling point of Caesium is 944 Kelvin (671 ℃). Caesium was discovered in the year 1860 by Robert Bunsen and Gustav Kirchhoff.

To the right (or below if you are using a mobile device with a smaller screen) you will find the information given above for the element Caesium ordered in tabular form, which might be easier to read and use if you want to quantify it in some sort.

Data about element Caesium

Chemical symbol
Element classification
Alkali metals
Atomic number
Relativ atomic mass
Atomic mass
132.9054519 u
1879 kg/m3
Melting point
301.6 K   (28.6 ℃)
Boiling point
944 K   (671 ℃)
Mineral hardness
0.2 Mohs
Discovered year
Discovered by
Robert Bunsen och Gustav Kirchhoff