- Similar to giant ionic structures except that there are no charged ions
- All the atoms are bonded to each other by strong covalent bonds
- They have very high melting and boiling points
- They don't conduct electricity - not even when molten
- They're usually soluble in water
- The main examples are : diamond and graphite, which are both made only from carbon atoms.
Diamond - Each carbon atom forms four covalent bonds in a very rigid giant covalent structure. This structure makes diamond the hardest natural substance, so it's used for drill tips.
Graphite - each carbon atom forms three covalent bonds, creating layers which are free to slide over each other. the layers are held together so loosely that they can be rubbed off onto paper. It also is the only non metal which is a good conductor of electricity.
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