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1. What is the basic difference between conductors and insulators? 2. How do semiconductors differ from conductors and insulators? 3. How many valence electrons does a conductor such as copper have? 4. How many valence electrons does a semiconductor have? 5. Name three of the best conductive materials. 6. What is the most widely used semiconductive material? 7. Why does a semiconductor have fewer free electrons than a conductor? 8. How are covalent bonds formed? 9. What is meant by the term intrinsic?