First of all, I was wondering, what is the word that classifies softness/hardness? Such as Color is for red/green. Now off to the main point... What makes something soft or hard? Lets take rubber for example. I thought the closer the atoms, the harder the rubber. But then, the more we stretch it, the harder it becomes. But in that case, the atoms are more spread apart. On the other hand, if we bring atoms closer together than the bonds are, it will become softer. I am seriously missing some points as in this case, two principles clash together. Thx.