Cesium has an atomic number of 55, meaning each atom contains 55 protons in its nucleus.
The standard atomic weight of cesium is 132.91 u (unified atomic mass units).
Cesium is classified as a alkali metal.
Cesium is a solid at 20 Β°C (68 Β°F).
The melting point of cesium is 28.45 Β°C / 301.6 K.
The boiling point of cesium is 670.85 Β°C / 944 K.
The density of cesium is 1.93 g/cmΒ³ (20Β°C).
Cesium has a Pauling electronegativity of 0.79.
The electron configuration of cesium is [Xe] 6s1.
Cesium commonly exhibits the following oxidation states: +1.
Cesium was discovered in 1860 by Robert Bunsen and Gustav Kirchhoff.
Cesium is a stable element with no naturally occurring radioactive isotopes.
No essential biological role.
Cesium is used for: Atomic clocks; Photoelectric cells; Drilling fluids.