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Dalton
All matter is made of atoms
JJ Thomson
Discovered electrons using a cathode ray. Atom is uniform, positively charged sphere containing positively charged alpha particles
Ernest Rutherford
Discovered dense positive nucleus with gold foil experiment. Electrons are held close due to their attraction to the positively charged nucleus

Dalton Model - solid sphere

Thomson’s Plum Pudding Model - discovered electrons using cathode ray

Discovered dense positive nucleus, with gold foil experiment