To compare metals and nonmetals accurately based on the statements you provided, let's evaluate each one:
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Metals cannot be stretched into thin wires. Nonmetals can be stretched into thin wires.
- This statement is incorrect. Metals can be stretched into thin wires (they are ductile), whereas nonmetals are generally not.
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Metals are good insulators of electricity. Nonmetals tend to be good conductors of electricity.
- This statement is incorrect. Metals are good conductors of electricity, while nonmetals are generally poor conductors (they can be insulators).
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Metals tend to be good conductors of thermal energy. Nonmetals tend to be good insulators of thermal energy.
- This statement is correct. Metals are indeed good conductors of thermal energy, while nonmetals tend to insulate against thermal energy.
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Metals are dull and brittle. Nonmetals are shiny and malleable.
- This statement is incorrect. Metals are generally shiny (luster) and malleable (can be shaped without breaking), while nonmetals are often dull and brittle.
Based on this evaluation, the only correct statement comparing metals and nonmetals is the third one: "Metals tend to be good conductors of thermal energy. Nonmetals tend to be good insulators of thermal energy."