Which fact is true during a fission chain reaction?(1 point)The total number of protons will increase over time.The total number of protons will increase over time.The total number of protons will decrease over time.The total number of protons will decrease over time.The number of freely-moving neutrons decreases over time.The number of freely-moving neutrons decreases over time.The number of freely-moving neutrons increases over time.

During a fission reaction, the total number of protons remains the same. In other words, the charge is conserved. It is the neutron number that decreases during a fission reaction.

Therefore, 'The number of freely moving neutrons decreases over time' is the correct answer.

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