Question

which phrase describes nuclear fission? (1 point)
the spontaneous emission of radiation from an unstable nucleus
the process by which a large nucleus divides into smaller nuclei
a series of reactions in which particles from one reaction trigger the next reaction
the process by which small nuclei combine into a larger nucleus
check answer remaining attempts : 3

Explanation:

Nuclear fission is defined as the process where a large nucleus divides into smaller nuclei. The first option describes radioactive decay, the third describes a chain reaction, and the fourth describes nuclear fusion.

Answer:

the process by which a large nucleus divides into smaller nuclei