Categories of Crystalline Solids

Module 11. crystalline solids (repeating, geometric structures) and their properties

atomic solids

soft to very soft; very low melting points. Poor conductivity.

* from *group 18*
* Only reflect ***dispersion forces***

molecular solids

fairly soft; low to moderately high melting points. Poor conductivity.

* ***intermolecular forces***

covalent network solids

very hard; very high melting points; often poor conductivity

\
* __*atomic solid*____.__
* typically have carbon and silicon (as it can create multiple **covalent bonds**)
* has allotropes

ionic solids

hard, brittle; high melting points; poor conductivity

\
* surrounded by oppositely charged ions
* type of ions/ratio determine structure
* ***ionic bonds***

metallic solids

soft to hard; low to very high melting points; malleable and ductile; excellent conductivity

\
* __*atomic solid*__


* positive metal ions surrounded by sea of delocalized electrons
* ***metallic bonding***