() ? Conductors, semiconductors and insulators ? 1. State that solids can be classified into three types according to their electrical properties as conductors, semiconductors and insulators. 2. Give examples of conductors, semiconductors and insulators. ? 3. State that the different electrical properties of conductors, ? semiconductors and insulators can be explained by Band Theory. 4. State that in isolated atoms, the permitted energy levels ? consist of a series of sharply defined states. 5. State that in solids, the permitted energy levels associated ? with each state of the isolated atom forms a continuous band. ? 6. State that the two highest bands are known as the valence band and the conduction band, respectively. 7. State that the valence band contains electrons that can be ? considered to be bound to the atom. 8. State that the valence band is full in insulators and ? semiconductors. 9. State that the conduction band contains electrons that ? are free to move. 10. State that the conduction band is empty in insulators ? and semiconductors, but partially filled in conductors. Section 2 Electrons at work Covered How well can you do this? Conductors, semiconductors and insulators (continued) ? () 11. State that only partially filled bands may permit ? conduction.
Conductors, semiconductors and insulators () ? 1. State that solids can be classified into three types according to their electrical properties as conductors, semiconductors and insulators. ? 2. Give examples of conductors, semiconductors and insulators. ? 3. State that the different electrical properties of conductors, semiconductors and insulators can be explained by Band Theory. ? 4. State that in isolated atoms, the permitted energy levels consist of a series of sharply defined states. ? 5. State that in solids, the permitted energy levels associated with each state of the isolated atom forms a continuous band. ? 6. State that the two highest bands are known as the valence band and the conduction band, respectively. ? 7. State that the valence band contains electrons that can be considered to be bound to the atom. ? 8. State that the valence band is full in insulators and semiconductors. ? 9. State that the conduction band contains electrons that are free to move. ? 10. State that the conduction band is empty in insulators and semiconductors, but partially filled in conductors. ? Section 2 Electrons at work Conductors, semiconductors and insulators (continued) Covered () How well can you do this? ? 11. State that only partially filled bands may permit conduction. ?
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