Chemistry / Chem 0075 · Atom · ~20 seconds
Metals, Nonmetals, and Metalloids
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Elements sort into three classes by conductivity: metals conduct heat and electricity well, nonmetals conduct poorly, and metalloids sit in between.
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Copper wiring conducts electricity efficiently because copper is a metal; the sulfur in a match head does not, being a nonmetal.
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This three-way split is a starting classification — sharper trends tied to atomic structure are covered later in the course.