How are Lewis structures used to help determine bonding capacity?
They provide a visual understanding of where you need place the valance electrons so that the bonding atoms are satisfied. This is called the octet rule. It can be broken because of expections in some bonds between atoms or it can not meet the rule, and simply have less than 8 valence electrons. There is so much more to explain but im tired. The answer to your question is that they determine the placement of valence electrons, determine molecular/geomtric shapes and can tell you if have enough plutonium to make a gamma laser gun.