I should probably keep my mouth shut as I hate raising Zanzibar's ire, but atoms don't turn into energy in nuclear fission. The energy released is that which held the large atom together. The resultants are basically two smallers atoms and the energy that was needed to bind the larger atom. Same thing happens as an atom decays. As it loses it's constituants, the resultants are the lost electron (example) and the energy required to keep that electron. The lost energey can take many forms - heat, light, gamma rays...
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The Enlightened One believes that energy and matter are one; they just have different frequencies. She also teaches that thoughts can interchange the two.
Araye Bayebes
The Enlightened
As long as it's the truth you don't have to be afraid, I myself believe in the theory of matter being energy. Energy is a hard defined term which can be of several states, no one knows excactly how to define "energy", the only thing we know is it creates actions.
Matter is a sort of stationary energy. It's stored energy which can be extracted. The energy doesn't disappear (as you think i think) it's modified into a different energy, for example nuclear if it's uranium.
By theory, every object on earth can be modified into pure energy, now here's where it becomes tricky. What for IS pure energy and how should we make the stone modify into pure energy? Those questions don't need to be discussed, I believe we will come nowhere(as others have) and will just take up too much space if we're persistent.
I am not an opposer of the energy/matter idea. I am a man who believes that everything consists of something, what it is I do not know yet, future will tell unless we blow ourselves up.
I back you up on that, they split the atom, creating a new atom of protons and electrons(neutrons). The uranium isn't radioactive until you've split the atoms and broken the energetic links which bind the electron's, protones and neutrons together. I will not dwell further, it's still unexplored area for me what happens after the atoms are split and what radioactivity really is and what causes it to burn. I'll let you find that out.