Rb
Rubidium
Z 37 85.468 g/molAlkali Metal
Nucleus
37 Protons
48 Neutrons
37 Electrons (1 Valence)
Shell distribution: K2 • L8 • M18 • N8 • O1 • P0 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Kr]5s1
Oxidation States
CommonRare
0
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Radii
Empirical
235 pm2.35 Å
Calculated
265 pm2.65 Å
Covalent
220±9 pm2.2±0.09 Å
Van der Waals
303 pm3.03 Å
IonicRb+
152 pm1.52 Å
Crystal Structure
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Body-centered cubic
Pearson symbol
cI2
Space group
Im3m No. 229