Which conducts electricity better? Copper or stainless steel or nickel?

I'm ordering some alligator clips for the chem lab and I'm not sure which conducts energy better.

Answer:
Its Copper.

Of the metals commonly used for conductors, copper, has a high conductivity. Silver is more conductive, but due to cost it is not practical in most cases. However, it is used in specialized equipment, such as satellites, and as a thin plating to mitigate skin effect losses at high frequencies. Because of its ease of connection by soldering or clamping, copper is still the most common choice for most light-gauge wires.

Compared to copper, aluminium has worse conductivity per unit volume, but better conductivity per unit weight. In many cases, weight is more important than volume making aluminium the 'best' conductor material for certain applications. For example, it is commonly used for large-scale power distribution conductors such as overhead power lines. In many such cases, aluminium is used over a steel core that provides much greater tensile strength than would the aluminium alone [1][2].

Gold is occasionally used for very fine wires such as those used to wire bond integrated circuits to their lead frames. The contacts in electrical connectors are also commonly gold plated or gold flashed (over nickel). Silver is a better conductor than gold, however, gold is very resistant to the surface corrosion that is commonly suffered by copper, silver, or tin/lead alloys. This corrosion would have a very detrimental effect on connection quality over time; gold plating avoids that.
I think a nickel...lol
I know Copper is the least thing to conduct electricity...
But then again I'm just 14, my opinion shouldn't matter that much...
Copper has the highest conductivity by a large margin.

The conductivity of annealed copper is 100, hard drawn is 89.5
Nickel: 12-16
Steel: 3-15

That doesn't mean copper's the best material, it rusts.
COPPPEEER buts its a little expensive so stainless steels best choice
Copper will conduct better but will corrode easier. Nickel is very expensive but should resist corrosion better with not much of sacrifice in conduction. Stainless is a lousy conductor and will only be usable where something is very hot and has to be hooked to power or there are extreme sources of corrosives. From an electrochemical point of view, Cu clips and Cu wire will go a long way towards making critical voltage measurements come out right. Most physics labs don't even mention the thermocouple effect of dissimilar metals touching. I would get a mix of clips and use the nickel for the routine stuff. The Cu will get mangled too quick.
copper.. and you see copper wire everywhere.
copper

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