In a conductor, electric current can flow untethered, in an insulator it cannot flow. Metals such as copper are good energy conductors, while most non-metallic solids are good resistors, having an extremely high blockage to the flow of charge through them. Most atoms hold their electrons tightly and are insulators.
In chemistry, a non-metal is a chemical element that mostly lacks metallic attributes, and they are poor conductors of heat and electricity. In other words, they cannot be easily reshaped. The contrast in resistance due to the material is called resistivity. Non-metal, such as carbon and iodine do not conduct electricity. In non-metals, the bonding is strong, and electrons are not free to move around.
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