James chadwick dedicated most of his life to nuclear research. Contrary to the common belief of the time that there were electrons in the actual nucleus and circling it, Chadwick believed there was something in the nucleus that didn’t have a charge. He proved this with the help of Frederic and Irene Joliot-Curie’s experiment of shouting the proton out of wax with gamma rays. This particle became the neutron.
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This is how he set up his wax experiment to prove the existence of neutrons.
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Now that neutrons had been discovered, the atomic model started looking more like this with protons and neutrons in the nucleus and electrons in orbit.
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