Use words from the box to complete the sentences about the nuclear fission of uranium-235 (U-235).
| absorb | chain | electrons |
| fission | neutrons | split |
During the process, a slow-moving neutron is absorbed by a uranium-235 nucleus, causing it to .......... This process releases energy and emits two or three .......... These emitted particles can then cause subsequent nuclei to undergo fission, creating a self-sustaining .......... reaction.