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The objects that could hit the atoms in the model shown are neutrons.
A chain reaction is a reaction that is able to sustain itself. In this case, when the neutrons collide with the fissile nucleus, more neutrons are produced which collides with more fissile nuclei thereby sustaining the reaction.
Thus, the objects that could hit the atoms in the model shown are neutrons.
Learn more about chain reaction:https://brainly.com/question/12814600
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