Atomic Timeline
Regan Coppage
1803 - John Dalton
John Dalton's model of the atom was a small sphere that was indestructible.
1897 - J.J. Thomson
Thomson's model adds electrons (negatively charged particles) scattered throughout the atom; after his discovery of electrons.
1904 - Hantaro Nagaoka
Nagaoka suggested that the atom has a nucleus that electrons orbit around like saturn.
1911 - Ernest Rutherford
Rutherford's atom model has a dense positively charged nucleus and electrons moving around randomly.
1913 - Niels Bohr
In Bohr's model electrons move around in fixed distances from the nucleus.
1924 - Louis de Broglie
Louis de Broglie believed that instead of electrons traveling in spaced out circles they had properties of waves.
1926 - Erwin Shrodinger
Erwin Shrodinger produced the mathematical equations for the movement of the electrons, making the idea of the electron cloud.
1932 - James Chadwick
James Chadwick proves the existence of neutrons inside the nucleus.
History of the Atom (Atomic Theory)