Dalton came up with the Atomic TheoryDalton came up with the Atomic Theory somewhere in the early 1800s. The theory is as follows:
1. All matter is made of atoms. Atoms are indivisible and indestructible
2. All atoms of a given element are identical in mass and properties
3. Compounds are formed by a combination of two or more different kinds of atoms
4. A chemical reaction is a rearrangement of atoms.
more info at Dalton's Theory
Thompson Determines That Electrons are a part of Cathode RaysThompson then concluded that electrons were a part of atoms.
Thompson Wins the Nobel PrizeJ.J. Thompson wins the 1906 nobel prize.
Rutherford Performs His Gold ExperimentRutherford shot Alpha Rays through a sheet of gold foil to try and understand an atom better. What he found was that most of the atom's mass is in it's nucleus.
Bohr Joins RutherfordBohr joins Rutherford in his resaerch, claiming that his theory in incorrect. According to laws of physics, the atom should collapse on itself based on Rutherford's theory.
Bohr publishes his own theoryBohr publishes his theory about the atom model, looking to Planck's Quantum Theory for a guide.
Bohr wins the Nobel Prize in Physics