# How Identify the most important types of interparticle forces present in the solids of each of the following substances ? a. Ar b. CH_4 c. HCl d. CO e. HF f. NaNO_3 g. CaCl_2

$C {H}_{4}$ = van de waals forces or london forces
$N a N {O}_{3}$ = permanent dipole-dipole interactions
$C a C {l}_{2}$ = van de waals forces or london forces