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400
Democritus Atomic Theory
Thinks all atoms are different -
John Dalton's Atomic Theory
He thinks that atoms are tiny indestructible particles. -
J. J. Thomson's atomic Thory
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Hantaro Nagaoka's Atomic Theory
Thinks an atom has a central nuclous -
Earnest Rutherford's Atomic Theory
Thinks an atom has a dense, positivly charged nucleous -
Niels Bohr''s Atomic Theory
The electrons move in spherical orbits at fixed distances from the nucleus. -
Werner Heisenberg & Erwin Schrodinger
Developed mathematical equations to describe the motion of the electrons in atoms. Their work leads to the electron cloud model. -
James Chadwick
confirms the existance of neutrons
