Chemistry / Chem 1460 · Atom · ~20 seconds
Covalent Network Solids
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A covalent network solid is held by a continuous three-dimensional network of covalent bonds spanning the entire crystal.
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Diamond, a covalent carbon network, is among the hardest known substances and melts only above 3500 °C.
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Melting one means breaking actual covalent bonds throughout, not overcoming intermolecular attraction — why these solids are so hard.