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Year- 429 BC
Main Contribution-thought that all things are made up of atoms -
Year- 400 BC
Contribution-determined that all things were made up of earth, wind, fire, and air. -
Contribution-thought everything was made up of atoms
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Contribution-all matter made of atoms, and that it can not be made nor destoryed
Thought of four ideas different atoms, reactions when rearranged compound, all matter made of atoms cannot be made nor destoryed element atoms are the same. -
Contribution- helped discover radioactivity
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Contribution-found electrons via Cathode Ray Tube thought up the Plum pudding Model
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Contribution-measured the charge and mass of the electron
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Contribution-central positive nucleus surrounded by negative orbiting electrons
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Contribution-depicted atom as small positively charged nucleus surrounded by electrons moved in circular motion. made the Bohr Model
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Contribution-discovered isotopes of non-radioactive elements
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Contribution-found that consists of nucleus and shells. Proved Bohr Model incorrect. Created formula for finding where electrons are.
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Contribution-discovered the neutron
