I know this might sound silly, but I always wonder what happens when you say, tear a paper. Do I actually rip the atoms of the paper ? If so wouldn't nuclear forces be rather weak ? The question also reminds me of hardness. What makes an object hard ? is it the arrangement of atoms ? or to be specific, the number of electrons which holds the atoms together ? Sorry for the multiple-question post. I had a burst stream of consciousness. Thank you. Regards, Alvin.