Metals are good conductors of heat because

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they do not have free electrons

they gain electrons easily

their particles are very closely packed so the vibrations are passed on very quickly

all of the above.

answer is C.

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Detailed Solution

Concept- Metals have a regular structure. The particles are closely packed and vibrations are passed very quickly. Because of how tightly packed their particles are, metals are particularly good heat conductors because vibrations are transferred very fast. Additionally, they have a lot of free electrons. Metals get their strength and other qualities from these when they gently float through the framework. The free electrons that are nearest to the heat source are heated as the metal warms up. As a result, they move more quickly through the metal, crashing into other electrons as well as atoms. They naturally vibrate more quickly as a result (or move through the metal faster in the case of collisions with other free electrons). As a result, the metal swiftly dissipates the heat.
Hence, the correct answer is option 3.

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