Note that nuclear fission and radioactive decay overlap a little bit. Radioactive decay: this is the change of a less stable nucleus to a more stable nucleus.Nuclear fission: this is the splitting of one large atomic nucleus into smaller fragments.Nuclear fusion: this is the joining of two small atomic nuclei into one nucleus.There are three main types of nuclear reactions: Nuclear reactions can lead to chemical damage, which the body may notice and try to fix. Nuclear reactions do indeed occur in the human body, but the body does not use them. All of the physical processes that take place to keep a human body running (blood capturing oxygen, sugars being burned, DNA being constructed,etc.) are chemical processes and not nuclear processes. Most of the processes surrounding us in our daily life are chemical reactions and not nuclear reactions. In contrast, nuclear reactions involve the transformation of atomic nuclei. Chemical reactions do not change the nuclear structure of any atoms. Chemical reactions are the making, breaking, and rearranging of bonds between atoms in molecules. Inside each atom is a nucleus which is a collection of protons and neutrons linked together by nuclear bonds. A molecule is a series of atoms linked together by chemical (electromagnetic) bonds. All physical objects are made of molecules. Yes, there are nuclear reactions constantly occurring in our bodies, but there are very few of them compared to the chemical reactions, and they do not affect our bodies much. Public Domain Image, source: Christopher S.
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