The diference between covalent molecule lattice and covalent network lattice [duplicate]








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[How to know it when I see a covalent network?](/questions/24941/how-to-know-it-when-i-see-a-covalent-network)

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Can you tell me the difference between covalent molecular lattice and covalent network lattice?
Thanks for your help.




Covalent molecular compounds are actual molecules. Examples include $\ce{H\_2O, NH\_3, CO\_2, N\_2, I\_2, SO\_3, N\_2O\_4}$ etc. They are made of molecules which are made of covalently bonded atoms. Covalent network compounds form a network of bonds, and the whole object can almost be considered a "molecule," such as diamond (C network), silicon (Si network), graphene (C network), and black phosphorous (P network).


It's not a coincidence that all but one of the covalent molecules that I listed are gasses at room tenperature and pressure. The intermolcular bonds between molecules are relatively weak. On the other hand, every molecule in a network solid is surrounded in a network of strong covalent bonds.


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