Ba
Barium
Z 56 137.327 g/molAlkaline Earth Metal
Nucleus
56 Protons
81 Neutrons
56 Electrons (2 Valence)
Shell distribution: K2 • L8 • M18 • N18 • O8 • P2 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]6s2
Radii
Empirical
215 pm2.15 Å
Calculated
253 pm2.53 Å
Covalent
215±11 pm2.15±0.11 Å
van Der Waals
268 pm2.68 Å
Oxidation States
CommonRare
0
+1
+2
Crystal Structure
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Body-centred Cubic