37
85.468 u
Rb
Rubidium
Alkali Metal
Atomic Structure
Physical State
Group
1
Period
5
Block
s
Electron Configuration
[Kr] 5s¹
Physical Properties
Atomic Mass:
85.468 u
Electronegativity:
0.82
Atomic Radius:
303 pm
Ionization Energy:
4.177 eV
Density:
1.532 g/cm³
Melting Point:
312.46 K
Boiling Point:
961 K
Historical Information
Discovered By:
Robert Bunsen
Year Discovered:
1861