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48. Which statement about metallic bonding is not correct? a. In the presence of an electrical field, the electrons migrate toward the positive charge. b. The valence electrons move freely around the nuclei, allowing conduction of electricity. c. The flexibility of metals results from the mobility of the electron charge, which allows the nuclei to be moved without disrupting the overall structure of the metal. d. It describes the freely moving valence electrons as an "electron sea." e. The metal nuclei behave as negatively charged ions. 49. According to band theory, a good conductor is a material which has a(an) conduction band, and between them. a. partially filled; partially filled; a wide gap b. partially filled; empty; a narrow gap c. partially filled; empty; no gap d. completely filled; completely filled; a wide gap e. empty; partially filled; a narrow gap 50. According to band theory, an insulator is a material which has a(an) conduction band, and a gap between them. a. completely filled; completely filled; wide b. empty; partially filled; narrow c. partially filled; partially filled; wide d. partially filled; empty; narrow e. partially filled; empty; wide valence band, a(an) valence band, a(an) , (an).