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What knowledge did JJ Thompson add to the atom?

thank you to anyone who helps!!

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Ok so yeah here is what JJ Thompson added, I got these from my notes in science class, so here.


JJ Thompson discovered electrons '' plum pudding model'', positive sphere (pudding) with negative electrons (plums) throughout.
User Kan
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He discovered the ELECTRONS. which was first defined sub-atomic particle by anyone...
User Leonardo Andrade
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