Conductivity Thermal And Electrical

- Sn (Tin) is a metal and, like most metals, is a good electrical conductor at room temperature.
- Mica is an insulator — it does not allow free flow of electrons.
- Si (Silicon) is a semiconductor, and its conductivity increases only at higher temperatures or when doped.
- C (Carbon) in the form of diamond is an insulator, and in the form of graphite it is a poor conductor — not as good as a metal like tin.
Therefore, the best electrical conductor among the given options at room temperature is Sn (Tin). Final answer: Sn