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History of Matter
Question | Answer |
---|---|
Aristotle | Discovered 4 elements (Earth, Wind, Fire, Water) |
Alchemists | Chemists who were trying to make gold |
Lavoisier | Discovered 23 new elements and says particles cannot be broken apart |
John Dalton | Quaker who created Atomic Theory |
J.J. Thompson | Discovered the electron (negative charge) using Cathode Ray Tube experiment. Created Plum Pudding Model to describe the atom. |
Rutherford | Discovered atoms have a nucleus using the Gold Foil Experiment |
Chadwick | Discovered that the nucleus has protons and neutrons |
Bohr | Discovered that electrons are found on rings/orbitals on the outside of the atom |