- Atomic Radius (Å)
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