Many metals are good conductors. While technically a fridge is one, that's probably not the answer you're looking for. Anything conducts heat, even humans. Believe it or not but diamonds are some of the best conductors out there.
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Metals are good conductors of electricity, two of the best conductors are silver and copper.
A substance that allows electrons to pass through easily is a transition metal. Transition metals organize forming a sea of delocalized electrons and metal cations, allowing electrons to pass through easily.
A capacitor
Most metals conduct electricity. Copper and gold are probably the two best conductors. Steel conducts electricity, but it's an alloy not an element. Some other nonmetals also conduct electricity. Experiments are ongoing with carbon for use in computers. Neon is a gas which allows electricity to flow through it, making neon lights. Today Copper is used more than anything else when electricity must move from one place to another predictably.
All metals are generally good thermal conductors and electrical conductors because they have high densities. You will not find a metal that is a poor conductor like wood or glass, which are very poor electrical and thermal conductors. The best way to use metals and achieve poor thermal conductivity is by using two layers of metal and creating a vacuum between the two layers. Polyurethane is one of the best durable materials that offers good insulation (meaning that it's a poor thermal conductor), it's rated at 0.02 k W/m K. Polystyrene (styrofoam) is rated at 0.033 k W/m K. Fiberglass is 0.035 k W/m K. Corkboard is 0.04 k W/m K. Plywood is 0.11 k W/m K. Red Bricks are 0.6 k W/m K. Ordinary Glass is 0.8 k W/m K. Marble is 1.75 k W/m K. Granite is 2.2 k W/m K. OK, that gives you something to compare with. The closest thing to metal that is a good insulator (poor conductor) is Carbon Graphite, which comes in at 5.7 k W/m K. Surprisingly Stainless Steel is the next closest "poor" conductor and that comes in at 14 k W/m K., and Stainless Steel is not a poor conductor. Thermal heat conductivity occurs in three different ways: conduction (direct contact), convection (air contact) and radiant transfer (radiated through waves, e.g. sunlight waves) All metals can be considered as good electrical conductors, but Stainless Steel would also be the lower conductor of electricity.