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Can someone explain why we consider the electrons to move through a wire and not the nucleus? Couldnt atoms get ionised with losing a proton?

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Do you know how metallic bonding works? There are metal nuclei in a sea of free electrons. These electrons are the ones responsible for conduction.

Even in a chemical reaction, no atom gets ionized by losing a proton. Losing a proton will change the compound itself and should require huge energy.

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