The atoms furthest from the nucleus
These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.
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The neutrons are inside the nucleus, have no charge, and have mass.
Diagram 4 is the correct answer.
