28. Which of the following statements is true? a. An ideal metal conducts because each electron 'belongs' to every nucleus in the crystal lattice, while in an ideal insulator, each electron is localized to a single nucleus. b. Metals conduct much better than insulators because, per gram of material, metals have orders of magnitude more electrons. c. At sufficiently low temperatures, (intrinsic) semi-conductors are effectively insulators.
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