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==Key Stage 4==
===Meaning===
[[File:NuclearFission2Fission2.png|right|300px|thumb|An [[model]] of '''nuclear fission'''.]]
'''Nuclear fission''' is a process in which a large [[Unstable Isotope|unstable]] [[Atomic Nucleus|nucleus]] splits into two more [[Stable Isotope|stable]] [[Atomic Nucleus|nuclei]].