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Democritus
He was a Greek Philosopher. His theory was that it was possible to to break down matter, but not forever. He named this smallest piece "atomos" - or not to be cut. -
John Dalton
His theory was based on that elements could be distiguished by differences in weight. The basic ideas were. ----- All matter is composed of atoms. Atoms can't be made or destroyed. All atoms of the same element are identical. Different elements have different atoms. Chemical reactions occur when atoms are rearranged. Compounds can be made. -
J.J. Thomson
He created the plum pudding model. This model was a round, thick, liquidy substances whose charge was nuetral. -
Albert Einstein
Said that light is a particle. Created the Special Theory of Relativity - E=mc^2. -
Robert Millikan
He measured the charge of an electron by using two chambers. One was a drop chamber, and the other was ionized by X-Rays. -
Ernest Rutherford
Stated that in the center was a positive nucleus with negative surrounding electrons. Determined that the center was most of the weight in the gold foil experiment. -
Niels Bohr
Creator of the Bohr Model. It is not completely correct, but it is still a simple model of our modern model. It contained a proton center and levels of orbital shells (electron) around it. -
Louis de Broglie
Louis was a French physicist known for his ground breaking work on the quantum theory. But he made the discovery of particle-wave (electon) duality, which lead to the explaination of how atoms, molecules, and protons act. -
Wolfgang Pauli
Proposed a new quantum number and exclusion principle. -
Erwin Schrodinger
He was an Austrian physicist that used mathematical equations to create the quantum mechanical model. -
Werner Heisenberg
He was a physicist that worked with quantum mechanics. He used a formula to spectral lines. Also proposed the Principle of Indeterminancy - you can not know both position and velocity of an particle. -
James Chadwick
He discovered the neutron and established that the atomic number is determined by the number of protons in a atom.
