Be
Beryllium
Z 4 9.012 g/molAlkaline Earth Metal
Nucleus
4 Protons
5 Neutrons
4 Electrons (2 Valence)
Shell distribution: K2 • L2 • 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]2s2
Radii
Empirical
105 pm1.05 Å
Calculated
112 pm1.12 Å
Covalent
96±3 pm0.96±0.03 Å
van Der Waals
153 pm1.53 Å
Oxidation States
CommonRare
-2
0
0
+1
+2
Crystal Structure
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Hexagonal close-packed