B
Boron
Z 5 10.81 g/molMetalloid
Nucleus
5 Protons
6 Neutrons
5 Electrons (3 Valence)
Shell distribution: K2 • L3 • M0 • N0 • 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
[He]2s22p1
Oxidation States
CommonRare
0
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Radii
Empirical
85 pm0.85 Å
Calculated
87 pm0.87 Å
Covalent
84±3 pm0.84±0.03 Å
Van der Waals
192 pm1.92 Å
IonicB3+
27 pm0.27 Å
Crystal Structure
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RhombohedralStandard state
Pearson symbol
hR105
Space group
R3m No. 166
Density
2.34 g/cm³