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