How does the structure of atoms in a substance determine the substance's conductivity ? ( point ) If an atom's outer shell of electrons is loosely bound to the nucleus , the substance is a good conductor . an atom's outer shell of electrons is tightly bound to the nucleus , the substance is a good conductor . an atom's nucleus is positively charged , the substance is a good conductor an atom's outer shell of electrons is positively charged , the substance is a good conductor .
If an atom's outer shell of electrons is loosely bound to the nucleus, the substance is a good conductor. This is because the loosely held electrons are free to move and carry electric charge through the material. Good examples of such materials are metals like copper. On the other hand, if an atom's outer shell of electrons is tightly bound to the nucleus, the substance is a poor conductor. This is because very little electric charge can flow through the material. Examples of such materials are ceramics and plastics. The charge on the nucleus or outer shell of electrons does not determine conductivity.
