Symbol
Cs
Atomic Number
55
Atomic Mass
132.90545196
Protons
55
Neutrons
78
Electrons
55
Type
Alkali Metal
Isotopes
Cesium-133
Discovery Year
1860
Discovered By
Robert Bunsen, Gustav Kirchhoff
Group
1
Period
6
Boiling Point
671°C
Melting Point
28.5°C
Electron Configuration
[Xe] 6s¹
Density (g/cm³)
1.93
Crystal Structure
Body-centered cubic
Magnetism
Diamagnetic
Abundance in Earth's Crust
0.0002%
Phase at Room Temperature
Solid