The Atomic Theory

1
The Atomic Theory

• By Jake Meister, Charles Quirk, Matt Reisin, Ben
  Kessler

2
Greek Model 300 B.C.E

• The Greek model had the idea that everything is
  made out of spheres.
• As the Greeks say atoms are solid pieces of mass
  and make every thing.
• No ideas on what atoms were and any things like
  that or even if they exist.
• More info can be found here

Democritus
Greek Model
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Dalton Model-1803
John Dalton

• The Dalton model was proposed by John Dalton
• It proposes everything is made of atoms
• Different atoms for different elements
• Compounds are formed from elements
• Chemical reactions occur when atoms are
  rearranged
• More info can be found here

Dalton Model
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Thomson Model-1897

• J J Thomson was the one to discover the electron
• He found that it had a negative charge
• Found the electron by using a cathode ray tube.
• A cathode ray tube is a vacuum tube which
  consists of one or more electron guns which
  helped discover the electron
• Also known as the plum pudding model
• More info also found here

Thomson Model
J.J. Thomson
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Nagoka Model-1904

• Nagoka Model was made by Hantaro Nagoka
• Had the idea of the rings of Saturn being the
  basis for the structure of the atom
• The model had a atom with rings of electrons
  surrounding a concentrated positive charge
• More info here

Nagoka Model
Hantaro Nagoka
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Rutherford Model-1911
Ernest Rutherford

• Atom has a central positive nucleus surrounded by
  negative electrons.
• Most of the mass comes from that nucleus.
• Used the gold foil experiment
• The foil experiment goes like this you fire
  radioactive particles through a thin metal foil
  predominately gold Rutherford found 1 in 8000
  were deflected and that made the theory that
  atoms are mostly open space.
• More info also found here

Rutherford Model
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Bohr Model-1913

• Founded by Niels Bohr
• Also called the onion model
• Was thought that there was a nucleus with
  different electrons revolving in a circular order
  like a solar system called stationary
  revolutions.
• Bohr found the valence electron.
• More info here

Niels Bohr
Bohr Model
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Chadwick Model-1932

• Created by James Chadwick
• Chadwicks model introduced the neutron along
  with it has no charge. Though proposed by
  Rutherford Chadwick finalized it.
• More info here

Chadwick Model
James Chadwick
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Video of the Atom

• http//www.youtube.com/watch?vL2KmCTst2o0