Atomic Timeline

Regan Coppage

1803 - John Dalton

John Dalton's model of the atom was a small sphere that was indestructible.


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1897 - J.J. Thomson

Thomson's model adds electrons (negatively charged particles) scattered throughout the atom; after his discovery of electrons.
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1904
 - Hantaro Nagaoka


Nagaoka suggested that the atom has a nucleus that electrons orbit around like saturn.
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1911
 - Ernest Rutherford

Rutherford's atom model has a dense positively charged nucleus and electrons moving around randomly.
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1913
 - Niels Bohr


In Bohr's model electrons move around in fixed distances from the nucleus.
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1924
 - Louis de Broglie

Louis de Broglie believed that instead of electrons traveling in spaced out circles they had properties of waves.
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1926 - Erwin Shrodinger

Erwin Shrodinger produced the mathematical equations for the movement of the electrons, making the idea of the electron cloud.

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1932 - James Chadwick

James Chadwick proves the existence of neutrons inside the nucleus.

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History of the Atom (Atomic Theory)
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