Science

Timeline created by Hungarian Muffin
  • 440

    Democritus

    Atoms are uncuttable
  • 440

    Democritus

    Atoms are small, hard particles
  • 440

    Democritus

    atoms constantly move
  • 440

    Democritus

    conducted experiments in combining elements
  • 440

    Democritus

    atoms of the same element are exactly alike
  • Dalton

    All substances are made of atoms
  • Dalton

    elements combine in specific proportions
  • Rutherford

    conducted the gold foil experiment
  • Rutherford

    electrons move in empty space in the atom
  • Rutherford

    atoms contain mostly empty space
  • Rutherford

    there is a small, dense, positively charged nucleus
  • Bohr

    Electrons travel in different paths
  • Bohr

    electrons jump between levels from path to path
  • Thompson

    he conducted thecathode-ray tube experiment
  • Thompson

    there are small, negatively charged particles in an atom
  • Thomson

    his theory of atomic structure became the "plum pudding" model
  • Thomson

    There are small, negatively charged particles in an atom
  • S+H

    electons are found in electron clouds, not paths
  • S+H

    electron paths cannot be predicted
  • S+H

    atoms of different elements are different
  • S+H

    most of an atom's mass is in the nucleus