K
Potassium
Z 19 39.098 g/molAlkali Metal
Nucleus
19 Protons
20 Neutrons
19 Electrons (1 Valence)
Shell distribution: K2 • L8 • M8 • N1 • O0 • P0 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Ar]4s1
Oxidation States
CommonRare
0
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Radii
Empirical
220 pm2.2 Å
Calculated
243 pm2.43 Å
Covalent
203±12 pm2.03±0.12 Å
Van der Waals
275 pm2.75 Å
IonicK+
138 pm1.38 Å
Crystal Structure
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Body-centered cubic
Pearson symbol
cI2
Space group
Im3m No. 229