1. Free neutrons 
  2. Stable protons 
  3. Free electrons 
  4. Stable electrons 
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Option 3 : Free electrons 

  • 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. 
  • A conductor is a substance which allows free and unhindered movement of electrons (current) through it.
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