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Chadwick discovered the neutron by tracking paraffin wax

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James Chadwick noticed that certain radioactive reactions were ejecting particles that completely lacked an electrical charge. By forcing these phantom particles to smash into paraffin wax, he measured their exact mass and proved the neutron existed. He finally solved the mystery of why atoms weighed significantly more than their protons suggested.

Chadwick discovered the neutron by tracking paraffin wax
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