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Chemical energy arises through reactions between atoms of different materials, whilst nuclear energy arises through reactions in the nucleus of the atoms. In chemical reactions the nuclei are not affected or changed.
These are not chemical reactions but thermonuclear reactions.
Neutrons
No, only nuclear reactions can.
Nuclear energy is not produced by chemical reactions
In nuclear reactions the atom itself changes while molecules and/or structural organisation of atoms do in chemical and physical changes.
Both Chemical and nuclear reactions form new substances.
Chemical bonds are made and broken by chemical reactions. After chemical bonds have been broken, then energy is released, and if a chemical bond is made, then energy is absorbed.
Nuclear chemistry is a branch of chemistry related to chemical processes involved in nuclear reactions.
A nuclear reaction is much powerful than a chemical reaction.
You must not ask "what element", but "what isotope". Uranium-235 is one example of an ISOTOPE that is appropriate for nuclear fission. Uranium-238 is the same for chemical reactions, but for purposes of nuclear reactions, different isotopes must be considered to be different types of atoms.
Nuclear reactions involve the reaction of nuclei and does not involve transfer of electron as in regular chemical reactions.