Which of the following is a characteristic of fission reactions?

Fission reactions are characterized by the splitting of a heavy atomic nucleus into smaller nuclei, along with the release of a significant amount of energy and additional neutrons. The ability to produce more neutrons allows fission to initiate a chain reaction, where these released neutrons can collide with other heavy nuclei, causing them to fission as well. This self-sustaining process is a fundamental principle behind nuclear reactors and atomic bombs, making the potential for chain reactions a defining feature of fission.

In contrast to fission, other nuclear processes, such as fusion, typically require extremely high temperatures and pressures to force light nuclei together, which isn't a characteristic of fission. Moreover, fission does not generally involve light nuclei; it predominantly concerns heavy elements like uranium or plutonium. The statement regarding fission being safe and easy to manage is misleading, as while modern technologies can make it safer, the inherent risks and complexity involved in handling fission reactions are significant.