The appropriate model for nuclear fission is disturbing a drop of water such that it breaks into smaller droplets.
Nuclear fission refers to the disintegration of a large nucleus when it is bombarded with a small particle.
Usually, the protons in the nucleus repel each other strongly. Hence, as the atomic number of atoms continues to increase, this repulsion exceeds the nuclear attractive force causing the atom to disintegrate into smaller fragments called daughter nuclei when disturbed just as a drop of water such that it breaks into smaller droplets when disturbed.
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