Question

which process occurs in a fission nuclear reactor?
○ nuclei combine.
○ nuclei split apart.
○ neutrons combine.
○ neutrons split apart.

Explanation:

To solve this, we recall the definition of nuclear fission. Nuclear fission is the process where the nucleus of an atom splits into smaller parts (lighter nuclei). Nuclear fusion is when nuclei combine. Neutrons do not combine or split in the context of a fission reactor's main process. So the process in a fission reactor is nuclei splitting apart.

Answer:

B. Nuclei split apart.