| Filed | Form | Description | |
|---|---|---|---|
| 2/17/26 | 4 | 4 | → |
| 12/29/25 | 4 | 4 | → |
| 12/22/25 | 3 | 3 | → |
| 12/22/25 | 3 | 3 | → |
| 12/22/25 | 3 | 3 | → |
| 12/22/25 | 3 | 3 | → |
| ↓ | |||
Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent non-metal and semiconductor.