Good conductors of electricity- gold, silver, copper, aluminum, and graphite.
Bad conductors of electricity- plastic, rubber, glass, air, wood, charcoal, and diamond.
An electrical conductor is a substance in which electrical charge carriers, usually electrons, move easily from atom to atom with the application of voltage. Examples of good conductors are: Pure elemental silver is the best electrical conductor encountered in everyday life. Copper, steel, gold, aluminum, and brass are also good conductors.
For any substance to be a good conductor of electricity, it is required that it allows a free flow of electrons.
Electric current is simply the movement of free electrons in a substance.
Electrons carry current in a good conductor of electricity and they are negatively charged, which makes a good electrical conductor negatively charged.