Arrange the solids,liquids,and gases in order of:
$(a)$ increasing intermolecular space.
$(b)$ increasing intermolecular force.

(A) The intermolecular space is the distance between particles. In solids,particles are tightly packed; in liquids,they are slightly apart; and in gases,they are far apart. Therefore,the order of increasing intermolecular space is: $Solids < Liquids < Gases$.
$(b)$ The intermolecular force is the attraction between particles. Solids have the strongest forces holding particles together,while gases have the weakest. Therefore,the order of increasing intermolecular force is: $Gases < Liquids < Solids$.