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(BC) First to think about an atom
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(BC) Opposed Democritus's theory; four elements make up everything: Earth, air, water, and fire
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(BC) Everything is made up of something
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Three laws of motion <-- no atom
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"Dalton's Atomic Theory" (see link)
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Used cathode ray tube to discover electron; made the plum pudding model
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Atoms have positive charges in a small, but dense nucleus; "gold foil experiment"
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Electrons travel on rings (energy levels). The more rings the higher the energy level. They can move from ring to ring, but it takes energy.
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Described a cloud-like region where an electron is likely to be found
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Discovered the neutron
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(BC) Noticed Static
