In conductors, electrons can flow because their ________.

ions are free

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protons are free

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outer electrons are free

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negative ions are free

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Solution

The correct option is C outer electrons are free
The term 'conductor' implies that the outer electrons of the atoms are loosely bound and free to move through the material. This is what enables the flow of charges within a conductor.
For example, copper has one free outer electron, which makes it a good conductor.

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