This chem talk started out by talking about particles in solids and how they remain in place due to the fact that they have a strong attraction to each other. This was all a review of past concepts to me, but helped as a reminder. It was made clear that as you go through the states of matter, the distance between particles becomes larger. Soon, non polar molecules were introduced. They are a fairly simple concept since they have small intermolecular forces due to symmetrical charge distributions. Since the electrons in nonpolar molecules are distributed evenly, there are no permanent charges on the molecule making the forces small. Electronegativity has to do with which molecules are attracted to what. For example, two hydrogen atoms are attracted to oxygen because it has a more electronegativity. Substances with strong attractions to eachother are usually solids.