Answer:
a. b - tightly and uniformly packed
b. c - tightly but not uniformly packed like solids, and not floating freely like the gases
c. a d and e - the compounds and elements are not packed together like liquids and solids
d. a and b - both are made up of no more than one element
e. c and d - both have multiple elements combined to create a compound
f. e - elements and compounds mixed together
