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11 Pages • Essays / Projects • Year Uploaded: 2021
The first breakthrough into the structure of the atom came in the late 1800s when English physicist Joseph John (JJ) Thomson discovered that the atom wasn’t as indivisible as previously claimed. He carried out experiments using cathode rays produced in a discharge tube and found that the rays were attracted by positively charged metal plates but repelled by negatively charged ones. From this he deduced the rays must be negatively charged (Thomson, 1913).
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