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PCAT Chemical Processes – Elements as Electricity Conductors

Which of the following pure substances is a poor conductor of electricity?

A. Mercury
B. Lead
C. Aluminum
D. Iodine

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D is correct. Metals are good conductors of electricity because their outer electrons can freely move between atoms. This movement of electrons is referred to as electrical current. Lead, mercury, and aluminum are all metals, while iodine is a nonmetal on the right side of the periodic table.

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