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Which choice most accurately describes how the structure of metals makes them good conductors?
Metals have a large number of tightly-bound electrons that allow for the movement of electrons through them.
Metals have a large number of free outer electrons that allow for the movement of electrons through them.
Metals have a large number of free protons that allow for the movement of protons through them.
Metals have a large amount of tightly-bound protons that allow for the movement of protons through them.

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AL2006
Metals have a large number of free outer electrons that allow for
the movement of electrons through them.  Just a hint of voltage
along a piece of metal is enough to persuade some of the free
electrons to move in the direction of increasing voltage. 

Conductors have a large amount of bound electrons

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