A wide variety of crystalline solids of non-metals result from the formation of covalent bonds between adjacent atoms throughout the crystal. They are also called giant molecules. Covalent bonds are strong and directional in nature, therefore atoms are held very strongly at their positions.

$\mathrm{AlN}, \mathrm{diamond}, {\mathrm{SiO}}_2$ are covalent or network solids

Ions are the constituent particles of ionic solids. Such solids are formed by the three dimensional arrangements of cations and anions bound by strong coulombic (electrostatic) forces.

${\mathrm{CaF}}_2 , \mathrm{MgO}, \mathrm{ZnS}, \mathrm{NaCl}$ are ionic solids.

${\mathrm{H}}_2\mathrm{O}\left(\mathrm{ice}\right) \& {\mathrm{CCl}}_4$ are molecular solids.

$\mathrm{Cu}, \& \mathrm{Ag}$ are metalic solids