Which net work solid is a good conductor of electricity ?

Answer

To determine which network solid is a good conductor of electricity, we can analyze the properties of different network solids.

### Step-by-Step Solution:

1. **Understanding Network Solids**:
- Network solids are materials where atoms are bonded together in a continuous network by strong covalent bonds. This structure gives them unique properties.

2. **Identifying Conductivity**:
- For a solid to conduct electricity, it must have free-moving charged particles (like electrons). In most network solids, the electrons are localized and cannot move freely, making them poor conductors.

3. **Examining Graphite**:
- Graphite is a well-known network solid that can conduct electricity. In graphite, each carbon atom is bonded to three other carbon atoms in a planar hexagonal arrangement, forming layers.

4. **Layer Structure of Graphite**:
- The fourth bond of each carbon atom in graphite is a weak van der Waals bond that connects the layers. This weak bonding allows the layers to slide over each other easily.

5. **Free Electrons in Graphite**:
- Within each layer, there are delocalized electrons (or free electrons) that are not bound to any specific carbon atom. These delocalized electrons can move freely across the layers, allowing graphite to conduct electricity.

6. **Conclusion**:
- Therefore, the network solid that is a good conductor of electricity is **graphite**.