A 3-dimensional model because it helps visualize the orientation of atoms in the molecule.
Explanation:
In the solid state the molecules of matter are very close, thus having fixed shape, fixed volume and do not suffer compression. Because of this proximity, it is difficult to visualize all molecules, especially those that are more in the center of matter. For this reason, the student should use a three-dimensional model because it allows matter to be viewed from all angles, which helps to visualize the orientation of atoms in the molecule.
