How are chemical reactions and nuclear reactions differentg

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Chemical reactions only involve the valence electrons and how they form bonds with other atoms to get to a lower energy state.  Nuclear reaction, however, take place in the nucleus in which protons and neutrons are gained, lost, or changed.  nuclear reactions produce a lot more energy than chemical reactions due to their involvement of the nucleus. I hope this helps.  Let me know in the comments if anything is unclear.

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