___ is the non-metal which is a good conductor of electricity.

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for a non-metal that is a good conductor of electricity.

2. **Understand Non-Metals**: Generally, non-metals are known to be poor conductors of electricity. This is because they lack free electrons, which are necessary for conducting electricity.

3. **Consider Exceptions**: While most non-metals are bad conductors, there are exceptions. One notable exception is graphite, which is an allotropic form of carbon.

4. **Explain Graphite's Conductivity**: Graphite has a unique structure composed of hexagonal layers. Within these layers, there are free electrons that can move easily, allowing graphite to conduct electricity effectively.

5. **Conclude the Answer**: Therefore, the non-metal that is a good conductor of electricity is carbon, specifically in its graphite form.

**Final Answer**: Carbon (in the form of graphite) is the non-metal which is a good conductor of electricity.

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