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Metal, semiconductor, or insulator?

Exercise and reference answers

Items
  1. Item
    Very low resistivity
    Category
    Metal
  2. Item
    10⁻² to 10⁻⁸ Ω m
    Category
    Metal
  3. Item
    Intermediate resistivity
    Category
    Semiconductor
  4. Item
    Silicon and germanium
    Category
    Semiconductor
  5. Item
    Very high resistivity
    Category
    Insulator
  6. Item
    Above 10⁸ Ω m
    Category
    Insulator
Categories
  1. Item
    Metal
  2. Item
    Semiconductor
  3. Item
    Insulator

Explanation

Resistivity sorts them: metals 10⁻² to 10⁻⁸ Ω m, insulators above 10⁸, semiconductors in between. Source: syllabus Physics, Ch 14 Semiconductor Electronics.
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