Final answer:
During nuclear fission, a large nucleus splits into smaller nuclei, releasing energy. This process does not involve the combination of nuclei or an increase in mass. Instead, the fragments have smaller mass numbers than the original nucleus.
Explanation:
Nuclear Fission: Fundamental Changes
Nuclear fission is a process in which a heavy nucleus splits into two smaller nuclei, releasing a significant amount of energy in the process. This occurs when a neutron collides with a heavy nucleus, such as uranium-235 or plutonium-239, causing it to become unstable and break apart.
Key Change During Fission
The correct answer to the question concerns the changes that occur during nuclear fission. Several nuclei will combine into one nuclei. This statement is inaccurate; rather, in fission, the opposite occurs where a single nucleus splits into smaller nuclei, not the combination of several nuclei into one.
The option stating Nuclei will be produced with much larger mass numbers. is also incorrect, as the resulting nuclei from fission have smaller mass numbers than the original nucleus, contributing to the ejection of energy and additional neutrons.
Lastly, A nucleus will take in energy in large amounts, increasing its mass. In reality, fission generates energy as the nucleus is split, rather than requiring an input of energy to increase its mass.
Conclusion: The main change during nuclear fission is that a large nucleus divides into smaller nuclei, accompanied by a release of energy, not an increase in mass or combination of nuclei.
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