1 ene 1912 año - J. J. Thomson Atomic model
Descripción:
 Thomson introduced the “plum pudding” model based on his research of electrons. He theorized that electrons existed as particles inside a cloud of positivity because he was able to isolate electrons with the cathode ray 
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fecha:
1 ene 1912 año
Ahora mismo
 ~ 113 years ago 
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