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Why are metals better conductors of electricity than glass or ceramic materials?

User Rafi Kamal
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Metals have free electrons which are mobile and which would be involved in the conduction of electricity  unlike glass and ceramic materials.
User Daniel Hollands
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Metals have a larger number of loose electrons, while the electrons in glass and ceramics are packed tighter. Electricity is a flow of electrons, so looser electrons allow an easier flow.
User Repose
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