55
Cs
Cesium
Cesium
Cesium (Cs)
Alkali Metals · Solid · Period 6 · Group 1
Advertisement
Element Properties
- Atomic Number
- 55
- Symbol
- Cs
- Atomic Mass
- 132.9055
- Category
- Alkali Metals
- Standard State
- Solid
- Period
- 6
- Group
- 1
- Electronegativity
- 0.79
- Atomic Radius
- 343
- Ionization Energy
- 3.89
- Electron Affinity
- 0.47
- Oxidation States
- +1
- Melting Point
- 301.59 K (28.44 °C)
- Boiling Point
- 944 K (670.85 °C)
- Density
- 1.93
- Electron Configuration
- [Xe]6s1
- Year Discovered
- 1860
Frequently asked questions
What is the atomic number of Cesium?
The atomic number of Cesium is 55, which equals the number of protons in its nucleus.
What is the atomic mass of Cesium?
The atomic mass of Cesium is approximately 132.9055 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Cesium?
The electron configuration of Cesium is [Xe]6s1.
Where is Cesium in the periodic table?
Cesium is located in period 6, group 1.
When was Cesium discovered?
Cesium was discovered in 1860.
Related elements
Same group
1
H
Hydrogen
1.008
3
Li
Lithium
7
11
Na
Sodium
22.99
19
K
Potassium
39.098
37
Rb
Rubidium
85.468
87
Fr
Francium
223.02