Question

which of the following is not a property of most network solids (excluding graphite)?
conducts electricity
extreme melting and boiling points
very brittle
very hard

Explanation:

Network solids (e.g., diamond, quartz) have a continuous 3D covalent bond network. They are very hard, brittle, and have extreme melting/boiling points due to strong covalent bonds. Most (excluding graphite) lack free electrons, so they do not conduct electricity.

Answer:

conducts electricity