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Atomics Structure and Theories

In 1897, J.J.Thompson discovered negatively charged electrons. A few years later, he knew that
atoms had a neutral overall charge so he said atoms were like a plum pudding. The main part of the
pudding was positive, but there were negatively charged electrons dotted through it.…

Page 2

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Evidence and Conclusions

1. Most alpha particles passed straight through the foil: The atoms in the gold foil contained a
lot of empty space
2. Alpha particles are positively charged, when they are deflected back, they must have been
deflected by a force of repulsion: The atom must contain a…


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