What in the world is not chemistry?
I'm no expert, but as I understand it, Chemistry has to do with atoms gaining and losing electrons etc. You can change the characteristics of an atom by doing so or create compounds etc. On the other hand, when you start making one element into another, then you start to leave the realm of chemistry and approach Nuclear physics. Of course there are Nuclear chemists trying to arrange the protons, neutrons, and electrons into stable configurations for those (non-naturally on earth occuring) missing elements on the periodic table. But generally when you smash atoms like in an Atomic bomb, you are not doing chemistry, it's something else. Math is not chemistry although chemistry uses math, same for physics. Hope this will help you