Contributions
Democritusfirst proposed the idea that all matter was made up of tiny indivisible particles called atomos |
Ernest rutherfordperformed the gold foil experiment, determined that atoms contained a very small, positively charged core at the center, called this core the nucleus, came up with the nuclear model of the atom (with electrons orbiting around the nucleus) |
j.j. thomsonperformed a Cathode Ray Tube experiment and determined that the ray was composed of negative particles, call these electrons, determined the mass-charge ratio for an electron, came up with the "plum pudding" model of the atom |
Robert Millikanperformed an "oil-drop" experiment, determined the charge of one electron and using the known mass-charge ratio, was able to calculate the mass on one electron (9.11x10^-28g) |
Ernest Rutherfordperformed the gold foil experiment, determined that atoms contained a very small, positively charged core at the center, called this core the nucleus, came up with the nuclear model of the atom (with electrons orbiting around the nucleus)
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Niels bohrdeveloped the quantized orbit model of the atom, electrons can only reside in certain energy levels |