Greek who coined "atomos" and thought matter was composed of empty space thru which atoms moved.
Thought that changes in properties had to do with arraingment of the atoms not changes in atoms themselves
disputed Democritus- didn't like empty space ideal
Thought all matter was composed of atoms, atoms of given element are identical in size, matter, properties. and he believed that atoms couldn't be created, destroyed, subdivided
Used Cathode Ray Tube to find Charge:Mass ratio of electrons, discovered electrons
Created "Plum Pludding" model
Oil Drop experiement, found charge and mass of electron- led to discovery of protons
Gold Foil experiement. Led to discovery that there was a nucleus and electron cloud and atom was mostly empty space- Predicted neutrons
Came up with the Constant "h"
worked on light from heated objects and discovered quanta (minimum quant. of E that atoms can gain/lose)
Came up with the dual-wave particle nature of light, each particle of light is a bundle of energy, these bundles are photons( have zero mass and contain one quanta of energy
Proposed the model that when an electorn was hit with a photon that it would move up energy levels/orbitals and that there were fixed regions for each different amount of energy of electrons....WRONG
Proposed electrons as waves, came up with the Heinsenberg Uncertainty Principle, and came up with an equation that stated wavelength=h/mv
came up with his own equation, three of the quantum numbers were solutions of this equation (not spin)