| Formula / Notation | Si |
|---|---|
| CAS Number | 7440-21-3 |
| Molecular Weight | 28.09 |
| Melting Point | 1414.0 |
| Boiling Point | 3265.0 |
| Density | 2.33 |
| Solubility | Insoluble in water |
| Appearance | Dark grey with blue-metallic lustre, brittle crystalline |
| Also Known As | Si, silicon element |
| Category | Elements |
What is Silicon?
Silicon is a lustrous metalloid, atomic number 14, second most abundant element in Earth crust (28%). Pure silicon is a semiconductor - foundation of modern electronics. Forms SiO2 (silica) and silicates making up most rocks.
Formula & Notation
IUPAC Name: Silicon
Other Names / Synonyms: Si, silicon element
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 1414.0 |
| Boiling Point | 3265.0 |
| Density | 2.33 |
| Molecular Weight | 28.09 |
| Solubility | Insoluble in water |
| Appearance | Dark grey with blue-metallic lustre, brittle crystalline |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Silicon is a lustrous metalloid, atomic number 14, second most abundant element in Earth crust (28%). Pure silicon is a semiconductor - foundation of modern electronics. Forms SiO2 (silica) and silicates making up most rocks.
Semiconductor devices (transistors, ICs, solar cells). Glass and ceramics. Concrete (silicates). Silicone polymers (sealants, implants). Computer chips. Abrasives (SiC). Optical fibres. Photovoltaic cells.
Silicon dust (crystalline silica SiO2): severe lung hazard - causes silicosis with chronic inhalation (OSHA PEL 50 ug/m3). Silicon metal dust: irritant. Silane (SiH4) production: pyrophoric gas. Handle with respiratory protection.
The formula or notation for Silicon is: Si