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RATN Pg 84-89 Rutherford 1909 Gold foil experiment Shot streams of positive particles towards gold foil Most passed through but some particles were bounced back 1911 revised atomic theory. Proposed that the center of the atom is a tiny, dense, positively charged area called the nucleus Most of the atom’s mass is in the nucleus Calculated that diameter of nucleus as 100,000 times smaller than the diameter of the gold atom. Bohr 1913, Danish Scientist Suggested that electrons travel in definite paths around the nucleus Proposed no path between levels, but electrons can jump from one path to another Modern model Schrodinger & Heizenberg Electrons do not travel in definite paths Electron clouds - areas inside the atom where electrons are likely to be found