Giant Covalent Structures - Key Concepts
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What is a covalent bond?
A shared pair of electrons between two non-metal atoms
Covalent bonds form between which type of elements?
Non-metals
Where are non metals found on the periodic table?
To the left of the stepped line
Name 5 types of Giant Covalent Structure
Diamond Silicon dioxide Graphene Graphite Carbon Nanotubes Giant Covalent Structure - Huge network of atoms joined by strong covalent bonds, giving very high melting points. Not all fullerenes (hollow carbon allotropes) are Giant covalent structures because some contain a fixed number of atoms (like Buckminsterfullerene - C60) Giant Covalent Structures don’t have a fixed number of atoms
Define Giant Covalent Structure
Huge network of atoms joined by strong covalent bonds, giving very high melting points. Avoid sayiing in all directions forming a regular lattice structure as this is not true of all giant covalent structures, e.g. a single graphene layer
Describe the structure of diamond
Giant Covalent Structure Carbon allotrope with each carbon atom forming 4 strong covalent bonds with other carbon atoms in a regular 3D lattice structure No delocalised electrons Get into the habit of always saying ‘strong covalent bonds’ Giant covalent structure - a huge network of atoms joined by strong covalent bonds, giving very high melting points No delocalised electrons is why diamond, unlike graphite, does not conduct electricity