Si
Silicon
Z 14 28.085 g/molMetalloid
Nucleus
14 Protons
14 Neutrons
14 Electrons (4 Valence)
Shell distribution: K2 • L8 • M4 • 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
[Ne]3s23p2
Oxidation States
CommonRare
0
Pick a state to see its ions
Radii
Empirical
110 pm1.1 Å
Calculated
111 pm1.11 Å
Covalent
111±2 pm1.11±0.02 Å
Van der Waals
210 pm2.1 Å
IonicSi4+
40 pm0.4 Å
Crystal Structure
Use the arrow keys to rotate, hold Shift with the left and right arrows to roll, and press Home to reset the view.
DiamondStandard state
Pearson symbol
cF8
Space group
Fd3m No. 227
Density
2.33 g/cm³