## Introductory Chemistry (5th Edition)

a. $SF_{6}$ is a crystalline molecular solid. b. $C$ is an atomic solid. c. $MgCl_{2}$ is an ionic solid. d. $Ti$ is a crystalline atomic solid.
Ionic solids: Solids having formula units as composite units. Atomic solids: These solids have atoms as composite units. Molecular solids: These solids have molecules as composite units. a. $SF_{6}$ is a covalently bonded compound, hence it is a crystalline molecular solid. b. $C$ is an atomic solid. c. $MgCl_{2}$ has two ions, $Mg^{2+}$ and $Cl^{2-}$, hence it is an ionic solid. d. $Ti$ is a crystalline atomic solid.