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Jan 1, 1500
Democritus
Democritus discovered the atom by breaking things in half until he reached something that could not. His version of an Atom just looked like a spherical object.
WWW.ion.edu -
Period: Feb 26, 1500 to
Atoms
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Period: to
Modernized Atoms
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Dalton
all matter is made of atoms atoms are invisiable and indistrucatable
a chemical reaction is a rearrangement of atoms.
Model looked like a ball with smaller spheres around it
Ion.edu -
Thomson
he discovered the electron
he discovered the eletron in a series of experiments designed to study the nature of electric discharge in a high vaccum cathode ray tube and an area being investigates by numerous scientist
Model looked like a sphere with spherical objects inside.
WwW.chemheritage.org -
Rutherford
He calimed the center of an atom was posotive and outside was negative
Used the Geiger-Marsden experiment to prove this.
Said the Atom looked like a stationary object.
WWW.wikipedia.org -
Bohr
He discovered the electron and radioactivity. He proposed a theory for the hydrogen atom based on quantum thory that enregy theory that enery is transfered only in certain well defined quantities.
WWW.abyss.voregeon.edu -
Heisenberg & Schrodinger
They discovered there was no exact position of a quantum particle.
This was founded in the Heisenberg Uncertainty which helps find the exact location of a quantum particle.
Particles look like a cluster of particles.
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