Silicon | Periodic Table

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