Giant covalent structures or macromolecules.
Every atom is bonded to sevelra other atoms by stong covalent bonds therefore they have high melting and boiling points because it takes a huge amount of energy to break down the lattice structure.
Examples;
DIAMONDS - Formed of carbon and has a 3D giant structure. Every carbon atom is covalently bonded by 4 other atoms, this makes it hard and transparent. Silicon dioxide (sillica) has a similar structure.
GRAPHITE - Formed of carbon atoms and is covalently bonded by three other carbo atoms in a giant flat 2d layers. NO covalent bonds between layers making graphite slipperey and grey because the layers slide over each other. Graphite can conduct electricity.
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