A structural formula uses Blank to represent chemical bonds and shows how atoms in a molecule are connected to each other in a Blank 1 of 3 target 2 of 3 Molecular models are Blank models that show how atoms are connected to each other and their relative positions in space.
a) Lines; 3D; ball-and-stick
b) Dots; linear; space-filling
c) Symbols; 2D; structural
d) Arrows; planar; skeletal