Si
Silicon Symbol (Si)
Silicon is element 14 of the periodic table. Copy its symbol Si and see its atomic weight, electron configuration and common compounds.
What does Si mean?
Si is the chemical symbol for silicon, element number 14 in the periodic table. Silicon is a metalloid in group 14, period 3. It is the semiconductor at the heart of computer chips and solar cells; sand is mostly SiO₂.
Codes and properties
| Chemical symbol | Si |
|---|---|
| Atomic number (Z) | 14 |
| Standard atomic weight | 28.085 |
| Group / period | 14 / 3 |
| Element category | metalloid |
| Electron configuration | 1s² 2s² 2p⁶ 3s² 3p² |
| Common compounds | SiO₂, SiC, SiCl₄ |
How to type Si
- Plain text: type
Si— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as SiO₂ — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Si}in math mode, or use the mhchem package:\ce{Si}. - HTML:
Si; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for silicon?
The chemical symbol for silicon is Si.
What is the atomic number of silicon?
Silicon has atomic number 14, meaning each atom has 14 protons.
What is the electron configuration of silicon?
The ground-state electron configuration of silicon is 1s² 2s² 2p⁶ 3s² 3p².