Two models of the same compound are shown. a top line labeled model a saying c subscript 2 h subscript 4 o subscript 2. a bottom image with 2 c's connected by 1 black line. the left c has 3 h's connected to it by 1 black line each and the right c has 2 os attached to it, the top o by two black lines and the bottom o by 1 black line. the bottom o also has an h attached to it by 1 black line. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not.