55
132.91 u
Cs
Caesium
Alkali Metal
Atomic Structure
Physical State
Group
1
Period
6
Block
s
Electron Configuration
[Xe] 6s¹
Physical Properties
Atomic Mass:
132.91 u
Electronegativity:
0.79
Atomic Radius:
343 pm
Ionization Energy:
3.894 eV
Density:
1.93 g/cm³
Melting Point:
301.59 K
Boiling Point:
944 K
Historical Information
Discovered By:
Robert Bunsen
Year Discovered:
1860