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SiliconSi Electron 1 Electron 2 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2 Electron 3 Electron 4

Silicon is a chemical element with symbol Si and atomic number 14. It is a tetravalent metalloid, more reactive than germanium, the metalloid directly below it in the table. Controversy about silicon's character dates to its discovery.

14 Atomic Number
28.09  u Atomic Mass
1683.15  K Melting Point
3538  K Boiling Point
2.33  g/cm³ Density
1.5  Å Atomic Radius
1.11  Å Covalent Radius
1.9 Electronegativity
8.15  eV First Ionization Energy
134.07 Electron Affinity
3 Number of Shells
4 Electron Valency
2, 8, 4 Electron Shell Occupations
0.7  J/g Specific Heat