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Democritus was the first to suggest that matter could not be infinetly divided. Democrtis also stated that atoms can not created, destroyed or further divided.
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Aristotle disagreed with Democritus about atmos moving through empty space. He denied the existecnce of atoms completly on behalf of his personal idea.
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Dalton took the ideas of Democratis ideas about matter and revised them. He thought atoms are the smallest particles of matter. He also thought they were indivisible and indestructible.
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Crookes noticed a green flash of light within a cathrode ray tube while in a dark laboratory.
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Thompson discovered the electrons, the first subatomic particle. He disproved Dalton's thoery that atoms are indivisible. He also was awarded the Nobel Prize in 1906. He is known for his plum pudding model.
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To determine the charge of electrons Milikan designed an oil drop apparatus. He determined the mass of an electron and also it's magnitude.
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Studied positively charged particles and proved the plum pudding model wrong. He is also known for discovering the nucleus and protons.
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Chadwick discovered the neutron and recieved the Nobel Prize in 1903.