If a mixture of two metals was separated based on one metal's ability to allow electricity to pass, which property listed below was important?

ductility

conductivity

luster

malleability

I think the correct answer from the choices listed above is the second option. If a mixture of two metals was separated based on one metal's ability to allow electricity to pass, then the property that was important would be conductivity.  It is the ability to conduct electricity.

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

Standing in the sunlight and feeling the heat on your face (uv radiation is entering the skin, converting to infrared radiation, and is absorbed by your tissues)orstanding near a fire and feeling the heat on your skin (infrared radiation transfer)