10. Playing with a Full Deck:
       The Periodic Table
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       Group IVA: Insulators and Semiconductors

More electrons come into the silicon from the wire at the right, and mor holes are generated at the left as electrons migrate from the p-silicon into the wire of the external circuit. Continuous current flow is possible from right to left.

When holes and excess electrons have been eliminated, further current flow is impossible because there is nothing to carry the current through the silicon, which becomes an insulator. Continuous current flow from left to right is not possible.

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