* Pure phosphorus is a poor conductor of electricity, behaving more like an insulator.

* Doped phosphorus (meaning small amounts of impurities are added) can become a good conductor. This is the principle behind its use in the semiconductor industry.

Key Points:

* Semiconductors have electrical conductivity between that of a conductor and an insulator. They can conduct electricity, but not as easily as metals.

* Doping is the process of adding impurities to a semiconductor to change its electrical properties.

* Phosphorus is used as a dopant in silicon, making it a key element in transistors and integrated circuits.

Let me know if you'd like more details on how doping works!