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| Coined the term "atomos," which meant uncuttable |
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| Explained why elements always reacted in simple proportions, and why certain gases dissolved better in water than others. Came up with the 1st Atomic Theory |
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| Discovered the electron through his work on cathode rays and the isotope through his work on ionized gases |
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| Came up with the idea of a nucleus with electrons floating around it with the gold foil experiment |
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| Added quantum mechanics to the Rutherford model; electrons weren't locked into clearly defined orbits |
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| All particles behave to an extent like waves, and described the electrons as 3D waveforms |
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| Uncertainty principle: it is mathematically impossible obtain precise values for the position or momentum of a particle at any point in time |
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1. All matter is made of atoms. Atoms are indivisible and indestructible. (subatomic particles)
2. All atoms of a given element are identical in mass and properties (isotopes) |
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