Based on the locations of the elements aluminum Al , silicon Si , and phosphorus (​P​) on the periodic table, which lists the elements in order from the least conductive to the most conductive?

Phosphorus (P) is a nonmetal and conducts electricity poorly, so it is the least conductive. Silicon (Si) is a semiconductor, while aluminum (Al) is a metal and conducts electricity well. Therefore, the order from least to most conductive is P, Si, Al: choice D.

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