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How did James Chadwick contribute to the atomic theory?

James Chadwick played a vital role in the atomic theory, as he discovered the Neutron in atoms.

Neutrons are located in the center of an atom, in the nucleus along with the protons. They have neither a positive nor negative charge, but contribute the the atomic weight with the same effect as a proton.

Chadwick discovered this subatomic particle by using a neutron chamber in his experiments. Here is a link to a visual design of his experiment: http://www-outreach.phy.cam.ac.uk/camphy/neutron/neutron4_1.htm

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