Question

which phrase describes a nuclear chain reaction? (1 point)
a type of reaction which only takes place in the sun and other stars
a reaction in which small nuclei combine into a larger nucleus
a series of reactions in which particles from one reaction trigger the next reaction
a reaction in which particles spontaneously emit radiation

Explanation:

A nuclear chain - reaction is a self - sustaining series of nuclear fissions. In it, neutrons released from one fission event cause further fissions, meaning particles from one reaction trigger the next reaction. Reactions in the sun are fusion reactions (small nuclei combine into a larger nucleus), and spontaneous emission of radiation is radioactive decay.

Answer:

a series of reactions in which particles from one reaction trigger the next reaction