oct 25, 1909 - Ernest Ruthford disaproved the plum pudding model
Description:
Ernest found that the center of the atom was where the positive charge was along with most of its mass.
https://www.thoughtco.com/history-of-atomic-theory-4129185
Ruthford collaborated with Fredrick Soddy the create the "disintegration theory" "of radioactivity which regards radioactive phenomena as atomic – not molecular – processes."
https://www.nobelprize.org/prizes/chemistry/1908/rutherford/biographical/
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Atomic Theory Time Line
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