The correct answer is Option (2) → Silicon
- Silver: Metal → excellent conductor (high electrical conductivity due to free electrons).
- Silicon: Metalloid → classic semiconductor (intrinsic semiconductor; conductivity increases with temperature or doping; used in transistors, diodes, solar cells, etc.).
- Teflon (PTFE): Polymer → insulator (very high resistivity, used for electrical insulation).
- Glass: Amorphous non-metal → insulator (poor conductor, used in electrical insulation).
Semiconductors have electrical conductivity intermediate between conductors and insulators, and silicon is the most prominent example.
Thus, the correct answer is Silicon. |
