Question

Which answer describes what happens during a chain reaction? Protons released during a fission reaction trigger other fission reaction. Electrons and protons released during a fission reaction trigger other fission reactions. Neutrons released during a fission reaction trigger other fission reactions

Answer 1

Neutrons released during a fission reaction trigger other fission reactions. 

Answer 2

Neutrons released during a fission reaction trigger other fission reactions.

When an atom undergoes nuclear fission it releases free neutrons.

These free neutrons then trigger the next fission reaction by reacting with the next atom.

Thus a chain reaction is formed by neutrons released dusing a fission reaction.