-Atoms make covalent bonds by sharing electrons with other atoms from their highest energy level so they both have a full outer shell.
Simple Molecular Substances
- atoms form very strong covalent bonds to form small molecules of several atoms.
- the forces of attraction between these molecules (intermolecular forces) are weak.
- low melting & boiling points (intermolecular forces break easily)
- most are gases or liquids at room temperature
- don't conduct electricity
Giant Covalent Structures
- macromolecules
- atoms in these structures are bonded to each other by strong covalent bonds
- high melting & boiling points
- don't conduct electricity
Graphite - each carbon forms 3 covalent bonds - creates layers that can slide (because of weak intermolecular forces) - good conductor of heat & electricity because there is one delocalised electron per atom.
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