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Democritus

Published on Nov 20, 2015

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1.

Democritus

  • Used philosophy, not science
  • Atoms were indivisible and indestructible
  • Everything is made up of atoms
2.

John Dalton

  • pictures atoms as tiny, idestructible particles, with no interal structure.
3.

J.J. Thomson

  • Discovers the electron
  • The later leads to his "plum-pudding"model.
  • Pictures electrons embedded in a sphere of positive electrical charge.
4.

Ernest Rutherford

  • Physicist
  • Finds that an atom has a small, dense, positively charged nucleus.
  • Electrons move around the necleus.
5.

Neils Bohr

  • The electron move in a circular orbit.
  • At fixed distances from the neucleus.
6.

Erwin Schrodinger

  • made the math equation to describe the motion of electrons in atoms.
  • His work leads to the electron cloud model
7.

James Chadwick

  • English Physicist
  • Confirms the existence of neutron, which have no charge.
  • Atomic nuclei contain neutrons and positively charged protons.

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