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Aristotle discovered that stuff can be broken into elements, elements are atoms w/ different masses.
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Democritus claimed that everything is made up of atoms.
"Democritus Atom." Universe Today RSS. N.p., n.d. Web. 26 Feb. 2014 -
He discovered that certain gases only could be combined in certain proportions even if two different compounds shared the same common element or group of elements.
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Took the idea of the atoms and tried to incorporate the evidence for the electrons.
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Discovered nucleus most of an atom is empty space.
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Discovered that the Electron can only have a certain energy, difference elements have different energies." A atom absorbs or gives off energy( as in light or heat) the electron jumps to higher or lowe orbits.
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Electrons stuck in their orbits would set up" standing waves," He said that you can describe only the probability of where an electron could be, it was not definite.